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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