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Lakhmir Singh solutions Physics for Class 10 (2019 Exam) chapter 5 Refraction of Light

Chapters

Lakhmir Singh Solutions for Biology for Class 10 (2019 Exam)

Chapter 5 - Refraction of Light

Pages 173 - 175

What happens when a ray of light falls normally (or perpendiculary) on the surface of a plane mirror?

Q 1 | Page 173

A ray of light is incident on a plane mirror at an angle of 30°. What is the angle of reflection

Q 2 | Page 173

A ray of light strikes a plane mirror at an angle of 40° to the mirror surface. What will be the angle of reflection?

Q 3 | Page 173

A ray of light is incident normally on a plane mirror. What will be the

angle of incidence?

Q 4.1 | Page 173

A ray of light is incident normally on a plane mirror. What will be the

angle of reflection?

Q 4.2 | Page 173

What type of image is formed:

in a plane mirror?

Q 5.1 | Page 173

What type of image is formed:

on a cinema screen?

Q 5.2 | Page 173

What kind of mirror is required for obtaining a virtual image of the same size as the object?

Q 6 | Page 173

What is the name of the phenomenon in which the right side of an object appears to be the left side of the image in a plane mirror?

Q 7 | Page 173

Name the phenomenon responsible for the following effect:
When we sit in front of a plane mirror and write with our right hand, if appears in the mirror that we are writing with the left hand.

Q 8 | Page 173

If an object is placed at a distance of 10 cm in from of a plane mirror, how far would it be from its image?

Q 9 | Page 173

Which property of light makes a pencil cast a shadow when it is held in front of a light source?

Q 10 | Page 173

The image seen in a plane mirror cannot be formed on a screen. What name is given to this type of image?

Q 11 | Page 173

Fill in the following blank with a suitable word:
When light is reflected, the angles of incidence and reflection are ............ .

Q 12 | Page 173

State whether the following statement is true of false:
A student says that we can see an object because light from our eyes is reflected back by the object.

Q 13 | Page 173

Where is the image when you look at something in a mirror?

Q 14 | Page 173

A ray of light strikes a plane mirror such that its angle of incidence is 30°. What angle does the reflected ray make with the mirror surface?

Q 15 | Page 173

What is the difference between a real image and a virtual image? Give one example of each type of image

Q 16 | Page 173

The letter F is placed in front of a plane mirror:

How would its image look like when seen in a plane mirror?

Q 17.1 | Page 173

The letter F is placed in front of a plane mirror:

What is the name of the phenomenon involved?

Q 17.2 | Page 173

What is lateral inversion? Explain by giving a suitable example.

Q 18 | Page 173

Write the word AMBULANCE as it would appear when reflected in a plane mirror. Why is it sometimes written in this way (as its mirror image) on the front of an ambulance?

Q 19 | Page 173

What are the important differences between looking at a photograph of your face and looking at yourself in a plane mirror?

Q 20 | Page 173

A wall reflects light and a mirror also reflects light. What difference is three in the way they reflect light?

Q 21.1 | Page 173

Which type of reflection of light leads to the formation of images?

Q 21.2 | Page 173

What is the difference between regular reflection of light and diffuse reflection of light?

Q 22.1 | Page 174

What type of reflection of light takes place from:

(a) a cinema screen
(b) a plane mirror
(c) a cardboard
(d) still water surface of a lake

Q 22.2 | Page 174

What can  you see in a completely dark room? If you switch on an electric bulb in this dark room as a light source, explain how you could now see:
(a) the electric bulb
(b) a piece of white paper.

Q 23 | Page 174

A boy with a mouth 5 cm wide stands 2 m away from a plane mirror. Where is his image and how wide is the image of his mouth?

Q 24.1 | Page 174

The boy walks towards the mirror at a speed of 1 m/s. At what speed does his image approach him?

Q 24.2 | Page 174

An extended object in the form of an arrow pointing upward has been placed in front of a plane mirror. Draw a labelled ray-diagram to show the formation of its image.

Q 25.1 | Page 174

State the uses of plane mirrors.

Q 25.2 | Page 174

What is meant by 'reflection of light'?

Q 26.1 | Page 174

Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram:

(a) Incident ray
(b) Point of incidence
(c) Normal
(d) Reflected ray
(e) Angle of incidence
(f) Angle of reflection

Q 26.2 | Page 174

State and explain the laws of reflection of light at a plane surface (like a plane mirror), With the help of a labelled ray-diagram. Mark the angles of 'incidence' and 'reflection' clearly on the diagram. If the angle of reflection is 47.5°, what will be the angle of incidence?

Q 27 | Page 174

With the help of a labelled ray-diagram, describe how a plane mirror forms an image of a point source of light placed in front of it. State the characteristics of the image formed in a plane mirror.

Q 28 | Page 174

Explain why, though both a plane mirror and a sheet of paper reflect light but we can see the image of our face in a plane mirror but not in a sheet of paper.

Q 29.1 | Page 174

The image in a plane mirror is virtual and laterally inverted. What does this statement mean?

Q 29.2 | Page 174

Write all the capital letters of the alphabet which look the same in a plane mirror.

Q 29.3 | Page 174

The angle of reflection is equal to the angle of incidence:

(a) always
(b) sometimes
(c) under special conditions
(d) never

Q 30 | Page 174

The angle between an incident ray and the plane mirror is 30°. The total angle between the incident ray and reflected ray will be:

(a) 30°
(b) 60°
(c) 90°
(d) 120°

Q 31 | Page 174

A ray of light is incident on a plane mirror making an angle of 90° with the mirror surface. The angle of reflection for this ray of light will be:

(a) 45°
(b) 90°
(c) 0°
(d) 60°

Q 32 | Page 174

The image of an object formed by a plane mirror is:

(a) virtual
(b) real
(c) diminished
(d) upside-down

Q 33 | Page 174

The image formed by a plane mirror is :

(a) virtual, behind the mirror and enlarged.
(b) virtual, behind the mirror and of the same size as the object.
(c) real, at the surface of the mirror and enlarged.
(d) real, behind the mirror and of the same size as the object.

Q 34 | Page 174

The figure given alongside shows the image of a clock as seen a plane mirror. The correct time is:
Figure

(a) 2.25
(b) 2.35
(c) 6.45
(d) 9.25

Q 35 | Page 174

A man stands 10 m in front of a large plane mirror. How far must the walk before he is 5 m away from his image?

Q 36 | Page 174

An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the positions of the original and final images seen in the mirror is:

(a) 2 cm
(b) 4 cm
(c) 10 cm
(d) 22 cm

Q 37 | Page 175

A man sits in an optician's chair looking into  plane mirror which is 2 m away from him and views the image of a chart which faces the mirror and is 50 cm behind his head. How far away from his eyes does the chart appear to be?

Q 38 | Page 175

A ray of light strikes a plane mirror PQ at an angle of incidence of 30°, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is:

(a) 30°
(b) 45°
(c) 60°
(d) 90°

Q 39 | Page 175

Explain how to read the following message which was found on some blotting paper:

Q 400 | Page 175

Pages 178 - 179

Name the spherical mirror which has:

(a) virtual principal focus.
(b) real principal focus.

Q 1 | Page 178

Out of convex mirror and concave mirror, whose focus is situated behind the mirror?

Q 2 | Page 178

Find the focal length of a concave mirror whose radius of curvature is 32 cm.

Q 3 | Page 178

If the focal length of a convex mirror is 25 cm, what is its radius of curvature?

Q 4 | Page 178

Fill in the following blanks with suitable words:

Parallel rays of light are reflected by a concave mirror to a point called the ..........

Q 5.1 | Page 179

Fill in the following blanks with suitable words:

The focal length of a concave mirror is the distance from the ......... to the mirror.

Q 5.2 | Page 179

Fill in the following blanks with suitable words:

A concave mirror .......... rays of light whereas convex mirror ............ rays

Q 5.3 | Page 179

ill in the following blanks with suitable words:

For a convex mirror, parallel rays of light appear to diverge from a point called the ......... .

Q 5.4 | Page 179

What is a spherical mirror? Distinguish between a concave mirror and a convex mirror.

Q 6 | Page 179

Name the two types of spherical mirrors. What type of mirror is represented by the:

back side of a shining steel spoon?

Q 7.1 | Page 179

Name the two types of spherical mirrors. What type of mirror is represented by the:

front side of a shining steel spoon?

Q 7.2 | Page 179

What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror of convex mirror)? Calculate the focal length of a spherical mirror whose radius of curvature is 25 cm.

Q 8 | Page 179

Explain with a suitable diagram, how a concave mirror converges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of concave mirror in this diagram.

Q 9 | Page 179

Describe with a suitable diagram, how a convex mirror diverges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of concave mirror in this diagram.

Q 10 | Page 179

Define (a) centre of curvature (b) radius of curvature (c) pole (d) principal axis, and (e) aperture, of a spherical mirror with the help of a labelled diagram

Q 11 | Page 179

Define (i) principal focus of a concave mirror, and (ii) focal length of a concave mirror.

Q 12.1 | Page 179

Draw diagram to represent the action of a concave mirror on a beam of parallel light rays. Mark on this diagram principal axis, focus F, centre of curvature C, pole P and focal length f, of the concave mirror.

Q 12.2 | Page 179

What is meant by (i) principal focus of a convex mirror, and (ii) focal length of a convex mirror?

Q 13.1 | Page 179

Draw diagram to show the action of convex mirror on a beam of parallel light rays. Mark on this diagram principal axis, focus F, centre of curvature C, pole P and focal length f, of the convex mirror.

Q 13.2 | Page 179

In a convex spherical mirror, reflection of light takes place at:

(a) a flat surface
(b) a bent-in surface
(c) a bulging-our surface
(d) an uneven surface

Q 14 | Page 179

A diverging mirror is

(a) a plane mirror
(b) a convex mirror
(c) a concave mirror
(d) a shaving mirror

Q 15 | Page 179

If R is the radius of curvature of a spherical mirror and f is its focal length, then:

(aR = f
(bR = 2f
(c) R = f/2
(dR = 3f

Q 16 | Page 179

The focal length of a spherical mirror of radius of curvature 30 cm is:

(a) 10 cm
(b) 15 cm
(c) 20 cm
(d) 30 cm

Q 17 | Page 179

If the focal length of a spherical mirror is 12.5 cm, its radius of curvature will be:

(a) 25 cm
(b) 15 cm
(c) 20 cm
(d) 35 cm

Q 18 | Page 179

A communications satellite in orbit sends a parallel beam of signals down to earth. If these signals obey the same laws of reflection as light and are to be focussed onto a small receiving aerial, what should be the best shape of the metal 'dish' used to collect them?

Q 19 | Page 179

When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.

What is the nature of spherical mirror?

Q 20.1 | Page 179

When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.

Why is a hole burnt in the carbon paper?

Q 20.2 | Page 179

When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.

At which point of the spherical mirror the carbon paper is placed?

Q 20.3 | Page 179

When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.

What name is given to the distance between spherical mirror and carbon paper?

Q 20.4 | Page 179

When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.

What is the advantage of using a carbon paper rather than a white paper?

Q 20.5 | Page 179

Pages 189 - 191

For what position of an object, a concave mirror forms a real image equal in size to the object?

Q 1 | Page 189

Where should an object be placed in front of the concave mirror so as to obtain its virtual, erect and magnified image?

Q 2 | Page 189

Which type of mirror has:

positive focal length?

Q 2.1 | Page 191

For which positions of the object does a concave mirror produce an inverted, magnified an real image?

Q 3 | Page 189

If an object is placed at the focus of a concave mirror, where is the image formed?

Q 4 | Page 189

If an object is at infinity (very large distance) in front of a concave mirror, where is the image formed?

Q 5 | Page 189

For what position of an object, a real and diminished image is formed by a concave mirror?

Q 6 | Page 189

Copy this figure in your answer book and show the direction of the light ray after reflection:

Q 7 | Page 189

Draw the following diagram in your answer book and show the formation of image of the object AB with the help of suitable rays:

Q 8 | Page 189

Draw the following diagram in your answer book and show the formation of image with the help of suitable rays:

Q 9 | Page 189

Which type of mirror could be used as a dentist's mirror?

Q 10 | Page 189

Which kind of mirror is used in the headlights of a car? Why is it used for this purpose?

Q 11 | Page 189

Explain why, a ray of light passing through the centre of curvature of a concave mirror gets reflected back along the same path.

Q 12 | Page 189

What is the minimum number of rays required for locating the image formed by a concave mirror for an object? Draw a ray diagram to show the formation of a virtual image by a concave mirror.

Q 13 | Page 189

With the help of a ray diagram, determine the position, nature and size of the image formed of an object placed at the centre of curvature of a concave mirror.

Q 14 | Page 189

Described with the help of a diagram, the nature, size and position of the image formed when an object is placed beyond the centre of curvature of a concave mirror.

Q 15 | Page 189

If an object is placed at a distance of 8 cm from a concave mirror of focal length 10 cm, discuss the nature of the image formed by drawing the ray diagram.

Q 16 | Page 189

Draw a ray diagram showing how a concave mirror can be used to produce a real, inverted and diminished image of an object.

Q 17 | Page 189

Which mirror is used as a torch reflector? Draw a labelled diagram to show how a torch reflector can be used to produce a parallel beam of light. Where is the bulb placed in relation to the torch reflector?

Q 18 | Page 190

State where an object must be placed so that the image formed by a concave mirror is:

(a) erect and virtual.
(b) at infinity.
(c) the same size as the object.

Q 19 | Page 190

With the help of a labelled ray diagram, describe how a converging mirror can be used to give an enlarged upright image of an object.

Q 20 | Page 190

Make labelled ray diagrams to illustrate the formation of:

a real image by a converging mirror.

Q 21.1 | Page 190

Make labelled  ray diagrams to illustrate the formation of:

a virtual image by a converging mirror.
Mark clearly the pole, focus, centre of curvature and position of object in each case.

Q 21.2 | Page 190

Briefly describe how you would find the focal length of a concave mirror quickly but approximately

Q 22 | Page 190

Which type of mirror is used in a solar furnace? Support your answer with reason.

Q 23 | Page 190

Name the type of mirror used by dentists. How does it help?

Q 24 | Page 190

Explain why, concave mirrors are used as shaving mirrors.

Q 25 | Page 190

Give two uses of concave mirrors. Explain why you would choose concave mirrors for these uses.

Q 26 | Page 190

Draw ray-diagrams to show the formation of images when the object is places in front of a concave mirror (converging mirror):

(i) between its pole and focus
(ii) between its centre of curvature and focus

Q 27.1 | Page 190

between its pole and focus

Describe the nature, size and position of the image formed in each case.

State one use of concave mirror bases on the formation of image as in case (i) above.

Q 27.2 | Page 190

Give two circumstances in which a concave mirror can form a magnified image of an object placed in front of it. Illustrate your answer by drawing labelled ray diagrams for both.

Q 28.1 | Page 190

Which one of these circumstances enables a concave mirror to be used as a shaving mirror?

Q 28.2 | Page 190

The real image formed by a concave mirror is larger than the object when object is:

(a) at a distance equal to radius of curvature
(b) at a distance less than the focal length
(c) between focus and centre of curvature
(d) at a distance greater than radius of curvature

Q 29 | Page 190

The real image formed by a concave mirror is smaller than the object if the object is:

(a) between centre of curvature and focus
(b) at a distance greater than radius of curvature
(c) at a distance equal to radius of curvature
(d) at a distance equal to focal length

Q 30 | Page 190

The image formed by a concave mirror is virtual, erect and magnified. The position of object is:

(a) at focus
(b) between focus and centre of curvature
(c) at pole
(d) between pole and focus

Q 31 | Page 190

The image formed by a concave mirror is real, inverted and of the same size as the object. The position of the object must then be:

(a) at the focus
(b) between the centre of curvature and focus
(c) at the centre of curvature
(d) beyond the centre of curvature

Q 32 | Page 190

The image formed by a concave mirror is real, inverted and highly diminished (much smaller than the object). The object  must be:

(a) between pole and focus
(b) at focus
(c) at the centre of curvature
(d) at infinity

Q 33 | Page 190

The angle of incidence for of light passing through the centre of curvature of a concave mirror is:

(a) 45°
(b) 90°
(c) 0°
(d) 180°

Q 34 | Page 190

In the concave reflector of a torch, the bulb is placed:

(a) between the pole and focus of reflector
(b) at the focus of reflector
(c) between focus and centre of curvature of reflector
(d) at the centre of curvature of reflector

Q 35 | Page 191

The focal length of a small concave mirror is 2.5 cm. In order to use this concave mirror as a dentist's mirror, the distance of tooth from the mirror should be:

(a) 2.5 cm
(b) 1.5 cm
(c) 4.5 cm
(d) 3.5 cm

Q 36 | Page 191

An object is 100 mm in front of a concave mirror which produces an upright (erect image). The radius of curvature of the mirror is:

(a) less than 100 mm
(b) between 100 mm and 200 mm
(c) exactly 200 mm
(d) more than 200 mm

Q 37 | Page 191

A virtual, erect and magnified image of an object is to be produced with a concave mirror of focal length 12 cm. Which of the following object distance should be chosen for this purpose?

(i) 10 cm
(ii) 15 cm
(iii) 20 cm

Q 38 | Page 191

A concave mirror has a focal length of 25 cm. At which of the following distance should a person hold his face from this concave mirror so that it may act as a shaving mirror?

(a) 45 cm
(b) 20 cm
(c) 25 cm
(d) 30 cm

Q 39 | Page 191

An object is placed at the following distances from a concave mirror of focal length 15 cm, turn by turn:

(a) 35 cm
(b) 30 cm
(c) 20 cm
(d) 10 cm
Which position of the object will produce:

(i) a magnified real image?
(ii) a magnified virtual image?
(iii) a diminished real image?
(iv) an image of same size as the object?

Q 40 | Page 190

Pages 192 - 193

According to the "New Cartesian Singh Convention" for mirrors, what sign has been given to the focal length of:

a concave mirror?

Q 1 | Page 192

According to the "New Cartesian Singh Convention" for mirrors, what sign has been given to the focal length of:

a convex mirror?

Q 1.2 | Page 192

Which type of mirror has:

negative focal length?

Q 2.2 | Page 192

What is the nature of a mirror having a focal length of, +10 cm?

Q 3 | Page 192

What kind of mirror can have a focal length of, −20 cm?

Q 4 | Page 192

Complete the following sentence:

All the distances are measured from the .......... of a spherical mirror.

Q 5 | Page 192

What sign (+ve or −ve) has been given to the following on the basis of Cartesian Sigh Convention?

Height of a real image.

Q 6.1 | Page 192

What sign (+ve or −ve) has been given to the following on the basis of Cartesian Sigh Convention?

Height of a virtual image.

Q 6.2 | Page 192

Describe the New Cartesian Sigh Convention used in optics. Draw a labelled diagram to illustrate this sign convention.

Q 7 | Page 192

Giving reasons, state the 'signs' (positive or negative) which can be given to the following:

(a) object distance (u) for a concave mirror or convex mirror
(b) image distance (v) for a concave mirror
(c) image distance (v) for a convex mirror

Q 8 | Page 193

According to New Cartesian Sign Convention:

(a) focal length of concave mirror is positive and that of convex mirror is negative
(b) focal length of both concave and convex mirrors is positive
(c) focal length of both concave and convex mirrors is negative
(d) focal length of concave mirror is negative and that of convex mirror is positive

Q 8 | Page 193

According to New Cartesian Sign Convention:

(a) focal length of concave mirror is positive and that of convex mirror is negative
(b) focal length of both concave and convex mirrors is positive
(c) focal length of both concave and convex mirrors is negative
(d) focal length of concave mirror is negative and that of convex mirror is positive

Q 9 | Page 193

One of the following does not apply to a concave mirror. This is:

(a) focal length is negative
(b) image distance can be positive or negative
(c) image distance is always positive
(d) height of image can be positive or negative

Q 10 | Page 193

Pages 198 - 199

If the magnification of a body of size 1 m is 2, what is the size of the image?

Q 1 | Page 198

What is the position of the image when an object is placed at a distance of 20 cm from a concave mirror of focal length 20 cm?

Q 2 | Page 198

What is the nature of image formed by a concave mirror if the magnification produced by the mirror

+4

Q 3.1 | Page 198

What is the nature of image formed by a concave mirror if the magnification produced by the mirror

−2?

Q 3.2 | Page 198

State the relation between object distance, image distance and focal length of a spherical mirror (concave mirror or convex mirror).

Q 4 | Page 198

Write the mirror formula. Give the meaning of each symbol which occurs in it.

Q 5 | Page 198

What is the ratio of the height of an image to the height of an object known as?

Q 6 | Page 198

Define linear magnification produced by a mirror.

Q 7 | Page 198

Write down a formula for the magnification produced by a concave mirror.

in terms of height of object and height of image

Q 8.1 | Page 198

Write down a formula for the magnification produced by a concave mirror.

in terms of object distance and image distance

Q 8.2 | Page 198

Describe the nature of image formed when the object is placed at a distance of 20 cm from a concave mirror of focal length 10 cm

Q 10 | Page 198

Fill in the following blanks with suitable words:

If the magnification has a plus sign, than image is ......... and.........

Q 10.1 | Page 198

Fill in the following blanks with suitable words:

If the magnification has a minus sign, than the image is ......... and .......

Q 10.2 | Page 198

An object is placed at a distance of 10 cm from a concave mirror of focal length 20 cm.

Q 11.1 | Page 198

An object is placed at a distance of 10 cm from a concave mirror of focal length 20 cm.

Calculate the image distance.

Q 11.2 | Page 198

An object is placed at a distance of 10 cm from a concave mirror of focal length 20 cm.

State two characteristics of the image formed.

Q 11.3 | Page 198

If an object of 10 cm height is placed at a distance of 36 cm from a concave mirror of focal length 12 cm, find the position, nature and height of the image.

Q 12 | Page 198

At what distance from a concave mirror focal length 10 cm should an object 2 cm long be placed in order to get an erect image 6 cm tall?

Q 13 | Page 198

When an object is placed at a distance of 15 cm from a concave mirror, its image is formed at 10 cm in front of the mirror. Calculate the focal length of the mirror.

Q 14 | Page 198

An object 3 cm high is placed at a distance of 8 cm from a concave mirror which produces a virtual image 4.5 cm high:

(i) What is the focal length of the mirror?
(ii) What is the position of image?
(iii) Draw a ray-diagram to show the formation of image.

Q 15 | Page 198

A converging mirror forms a real image of height 4 cm of an object of height 1 cm placed 20 cm away from the mirror:

(i) Calculate the image distance.
(ii) What is the focal length of the mirror?

Q 16 | Page 198

An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed so that a sharp focussed image can be obtained? Find the size and nature of image.

Q 17 | Page 198

An object 3 cm high is placed at a distance of 10 cm in front of a converging mirror of focal length 20 cm. Find the position, nature and size of the image formed.

Q 18 | Page 199

A concave mirror has a focal length of 4 cm and an object 2 cm tall is placed 9 cm away from it. Find the nature, position and size of the image formed.

Q 19 | Page 199

When an object is placed 20 cm from a concave mirror, a real image magnified three times is formed. Find:

(a) the focal length of the mirror.
(b) Where must the object be placed to give a virtual images three times the height of the object?

Q 20 | Page 199

A dentist's mirror has a radius of curvature of 3 cm. How far must it be placed from a small dental cavity to give a virtual image of the cavity that is magnified five times?

Q 21 | Page 199

A large concave mirror has a radius of curvature of 1.5 m. A person stands 10 m in front of the mirror. Where is the person's image?

Q 22 | Page 199

An object of 5.0 cm size is placed at a distance of 20.0 cm from a converging mirror of focal length 15.0 cm. At what distance from the mirror should a screen be placed to get the sharp image? Also calculate the size of the image.

Q 23 | Page 199

A concave mirror produces three times enlarged virtual image of an object placed at 10 cm in front of it. Calculate the radius of curvature of the mirror.

Q 24 | Page 199

A bright object 50 mm high stands on the axis of a concave mirror of focal length 100 mm and at a distance of 300 mm from the concave mirror. How big will the image be?

Q 25 | Page 199

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