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प्रश्न
How is the focal length of a spherical mirror related to its radius of curvature?
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उत्तर
Focal length is half the radius of curvature of a spherical mirror.
f = `"R"/2`
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संबंधित प्रश्न
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.
A ray of light is incident normally on a plane mirror. What will be the
angle of reflection?
What type of image is formed:
on a cinema screen?
Complete the following sentence:
All the distances are measured from the .......... of a spherical mirror.
State whether the image in part (a) is real or virtual?
The image formed by a convex mirror is of size one third the size of object. How are u and v related?
Define the following term:
concave mirror
Numerical problem.
The radius of curvature of a spherical mirror is 25 cm. Find its focal length.
Define the following terms in the context of a diverging mirror:
- Principal focus
- Focal length
Draw a labelled ray diagram to illustrate your answer.
