Q.

For the determination of the focal length of a convex mirror, a convex lens is required because

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a

it is not possible to obtain the image produced by a convex mirror on the screen

b

a convex lens has high resolving power so it helps to measure the focal length correctly

c

a convex mirror always forms a real image which is diminished by the convex lens

d

none of these

answer is A.

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Detailed Solution

A convex mirror always forms a virtual image which can't be cast on a screen. Hence, a convex lens is used to find the focal length of a convex mirror.
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For the determination of the focal length of a convex mirror, a convex lens is required because