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प्रश्न
The focal length of a concave mirror is 10 cm. Find its radius of curvature.
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उत्तर
Radius of curvature = 2 × focal length
Or, R = 2f = 2 × 10 = 20 cm
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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.
Name the kind of mirror used to obtain :
A real and enlarged image
Name the kind of mirror used to obtain:
A virtual and enlarged image
Name the kind of mirror used to obtain:
A virtual and diminished image
State two uses of a concave mirror.
The radius of curvature of a convex mirror is 40 cm. Find its focal length.
A concave mirror forms a virtual image of size twice that of the object placed at a distance 5 cm from it.
Find : (a) the focal length of the mirror (b) position of image
An object 5 cm high forms a virtual image of 1.25 cm high, when placed in front of a convex mirror at a distance of 24 cm. Calculate:
- the position of the image
- the focal length of the convex mirror.
The image formed in a plane mirror is always inverted.
