Draw a Ray Diagram in Each of the Following Cases to Show the Formation of Image, When the Object is Placed : (I) Between the Optical Centre and Principal Focus - Science

Advertisements
Advertisements
Diagram

Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed :

(i) between the optical centre and principal focus of a convex lens.
(ii) anywhere in front of a concave lens.
(iii) at 2F of a convex lens.
State the signs and values of magnifications in the above-mentioned cases (i) and (ii).

Advertisements

Solution

(i) When an object is placed between the optical center and principal focus of a convex lens

Since the image formed is virtual and erect so sign of magnification will be positive. Moreover, the image formed is magnified therefore the absolute value of magnification will be greater than one. 

(ii) When an object is placed anywhere in front of a concave lens. 

Since the image formed is virtual and erect so sign of magnification will be positive. Moreover, the image formed is diminished therefore the absolute value of magnification will be less than one.  

(iii) When an object is placed at 2F of a convex lens.

  Is there an error in this question or solution?
2019-2020 (February) Delhi (Set 1)

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

A simple microscope is used by watch repairers. Give reason.


A student focused the Sun rays using an optical device 'X' on a screen S as shown.

From this it may be concluded that the device 'X' is a (select the correct option)

(A) Convex lens of focal length 10 cm.

(B) Convex lens of radius of curvature 20 cm.

(C) Convex lens of focal length 20 cm.

(D) Concave mirror of focal length 20 cm.


Define the following term in the context of spherical mirrors:- Principal focus


Explain the following term related to spherical lenses:- centres of curvature


Name the type of mirror used in the following situation.

Headlights of a car

Support your answer with reason.


Fill in the blanks:

Image formed by a convex ________ is always virtual and smaller in size.


Fill in the blanks:

An image formed by a ________ mirror is always of the same size as that of the object.


Fill in the blanks:

An image which can be obtained on a screen is called a _______image.


Mark ‘T’ if the statement is true and ‘F’ if it is false:

We can obtain an enlarged and erect image by a convex mirror. (T/F)


Mark ‘T’ if the statement is true and ‘F’ if it is false:

We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)


Mark ‘T’ if the statement is true and ‘F’ if it is false:

A concave mirror always forms a real image. (T/F)


Match the items given in Column I with one or more items of Column II.

Column I Column II
A plane mirror Used as a magnifying glass.
A convex mirror Can form image of objects spread over a large area.
A convex lens Used by dentists to see enlarged image of teeth.
A concave mirror The image is always inverted and magnified.
A concave lens The image is erect and of the same size as the object.
  The image is erect and smaller in size than the object

Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.


Give one use each of a concave and a convex mirror.


Which type of mirror can form a real image?


Define Radius of curvature of the spherical mirror


Define the Focal length of a spherical mirror


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

 


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


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?


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

What is the name of the phenomenon involved?

 


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


Name the spherical mirror which can produce a real and diminished image of an object.


Write true or false 

A virtual image formed by a spherical mirror is always erect and situated behind the mirror.


A ray of light travels from a denser medium to a rarer medium. How will it bend?


What do you mean by the term dispersion?


State the two kinds of spherical mirror and distinguish them with the aid of proper diagrams.


What do you understand by the focus and focal length of a spherical mirror? Show them on the separate diagrams for each of a concave mirror and a convex mirror.


How is a spherical mirror used to converge a beam of light at a point? Name the type of mirror used.


How is the focal length of a spherical mirror related to its radius


Draw separate diagrams for the formation of virtual image of an object by convex mirror. State the difference between concave and convex image.


Name the kind of mirror used to obtain
(a) a real and enlarged image
(b) a virtual and enlarged image
(c) a real and diminished image, and
(d) a virtual and diminished image.


If a spherical mirror breaks, what type of mirrors are the individual pieces?


Three mirrors are created from a single sphere. Which of the following - pole, centre of curvature, radius of curvature, principal axis - will be common to them and which will not be common? 


The diagram below in Figure, shows a convex mirror. C is its centre of curvature and F is its focus. (i) Draw two rays from A and hence locate the position of image of object OA. Label the image IB. (ii) State three characteristics of the image.


What type of mirror can be used to obtain a real image of an object?


Discuss the position and nature of image formed by a concave mirror when an object is moved from infinity towards the pole of mirror. 


State two uses of a concave mirror. 


A real and enlarged image can be obtained by using a


A straight stick partly dipped in water obliquely, appears to be bent at the surface of water.


Choose the correct alternative and rewrite the following:

Mirror used by a dental surgeon is ..........................


Answer the following question:
Distinguish between the convex mirror and the concave mirror.


Does the mirror name by your form a real image for all locations? Give a reason for your answer.


Define the term Principal axis.


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

What is the focal length of a plane mirror?

How can you distinguish between a convex mirror and a concave mirror? Explain.

An object 5 cm in height is placed at a distance of 30 m in front of a concave mirror of focal length 40 cm. By scale, drawing finds the nature, size, position, and magnification of the image.

The spherical mirror with a reflecting surface curved inward is called


The spherical mirror used as a rear view mirror in the vehicle is


The distance from the pole to the focus is called


If the focal length of a spherical mirror is 10 cm, what is the value of its radius of curvature?


The spherical mirror used in a beauty parlour as make-up mirror is _______.


Geometric centre of the spherical mirror is ______.


Define focal length.


Numerical problem.

The radius of curvature of a spherical mirror is 25 cm. Find its focal length.


Assertion: Incident ray is directed towards the centre of curvature of spherical mirror. After reflection it retraces its path.

Reason: Angle of incidence (i) = Angle of reflection (r) = 0°


Name the two types of spherical mirrors.


The radius of curvature of a spherical mirror is 18 cm. What is the focal length of this mirror?


A ray of light is incident towards a plane mirror at an angle of 30° with the mirror surface. What will be the angle of reflection?


For a spherical mirror, ______ is true.


A spherical mirror whose reflecting surface is curved outwards is called ______ mirror.


The minimum length of the mirror required to see the full image of the person is half ‘ of his height.


The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.


How tall does a mirror have to be to fit an entire person’s body?


What is the focal length (f) of a mirror?


Define the radius of curvature.


What is “aperture”?


In the figure shown, the image of a real object is formed at the point I. AB is the principal axis of the mirror. The mirror must be:


A converging lens of focal length f is placed at a distance 0.3 m from an object to produce an image on a screen 0.9 m from the lens. With the object and the screen in the same positions, an image of the object could also be produced on the screen by placing a converging lens of focal length.


In normal adjustment, for a refracting telescope, the distance between objective and eye piece is 30 cm. The focal length of the objective, when the angular magnification of the telescope is 2, will be ______.


Share
Notifications



      Forgot password?
Use app×