Advertisements
Advertisements
प्रश्न
Describe the positions of the source of light with respect to a concave mirror in Floodlight.
Advertisements
उत्तर
In a floodlight, the light source is slightly beyond the radius of curvature, which gives us the right light.
APPEARS IN
संबंधित प्रश्न
"A concave mirror of focal length 15 cm can form a magnified, erect as well as inverted image of an object placed in front of it." Justify this statement stating the position of the object with respect to the pole of the mirror in both the cases for obtaining the images.
To determine the approximate value of the focal length of a given concave mirror, you focus the image of a distant object formed by the mirror on a screen. The image obtained on the serene, as compared to the object is always:
(a) Laterally inverted and diminished
(b) Inverted and diminished
(c) Erect and diminished
(d) Erect and highly diminished
Draw ray diagrams to show the principal focus of a concave mirror.
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should the position of the object be relative to the mirror? Draw ray diagram to justify your answer.
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
Three students A, B and C focussed a distant building on a screen with the help of a concave mirror. To determine focal length of the concave mirror they measured the distances as given below:
Student A : From mirror to the screen
Student B : From building to the screen
Student C : From building to the mirror
Who measured the focal length correctly ;
(a) Only A
(b) Only B
(c) A and B
(d) B and C
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°
Out of convex mirror and concave mirror, whose focus is situated behind the mirror?
If an object is placed at the focus of a concave mirror, where is the image formed?
Copy this figure in your answer book and show the direction of the light ray after reflection:
Draw the following diagram in your answer book and show the formation of image with the help of suitable rays:
Explain why, a ray of light passing through the centre of curvature of a concave mirror gets reflected back along the same path.
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.
State where an object must be placed so that the image formed by a concave mirror is:
(b) at infinity.
(c) the same size as the object.
- Draw ray-diagrams to show the formation of images when the object is placed in front of a concave mirror (converging mirror):
- between its pole and focus
- between its centre of curvature and focus.
Describe the nature, size and position of the image formed in each case.
- State one use of concave mirror based on the formation of image as in case (i) above.
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.
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
According to the “New Cartesian Sign Convention” for mirrors, what sign has been given to the focal length of:
- a concave mirror?
- a convex mirror?
What kind of mirror can have a focal length of, −20 cm?
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.
If the object is moved further away from the mirror, what changes are there in the position and size of the image?
At what distance from a concave mirror of focal length 10 cm should an object be placed so that:
- its real image is formed 20 cm from the mirror?
- its virtual image is formed 20 cm from the mirror?
What type of image/images are formed by:
a convex mirror?
The mirror which can form a magnified image of an object is:
(a) convex mirror
(b) plane mirror
(c) concave mirror
(d) both convex and concave mirror
An object is placed 15 cm from (a) a converging mirror, and (b) a diverging mirror, of radius of curvature 20 cm. Calculate the image position and magnification in each case.
Draw the ray diagram and also state the position, the relative size and the nature of image formed by a concave mirror when the object is placed at the centre of curvature of the mirror.
Why does obtaining the image of the sun on paper with the help of a concave mirror burn the paper?
Study the following ray diagram and list two mistakes committed by the student while tracing it. Rectify these mistakes by drawing the correct ray diagram to show the real position and size of the image corresponding to the position of the object AB.
The mirror used by the ophthalmologist to examine the eye is _______.
The radius of curvature of a concave mirror whose focal length is 5cm is ______
Which of the following can make a parallel beam of light when light from a point source is incident on it?
In which of the following, the image of an object placed at infinity will be highly diminished and point sized?
The mirror having reflection surface curved outward ______.
While looking at the above diagram, Nalini concluded the following.
- the image of the object will be a virtual one.
- the reflected ray will travel along the same path as the incident ray but in opposite direction.
- the image of the object will be inverted.
- this is a concave mirror and hence the focal length will be negative.
Which one of the above statements are correct?
Under which of the following conditions a concave mirror can form an image larger than the actual object?
The focal length of a concave mirror is 5cm. Its radius of curvature is ______.
