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A concave mirror and a convex lens have ...

A concave mirror and a convex lens have the same focal length in air. When they are submerged in glycerine, the focal length

A

of both still remains unchanged

B

of the mirror remains unchanged while that of the lens increases

C

of the mirror remains unchanged while that of the lens decreases

D

of both may increase or decrease

Text Solution

Verified by Experts

The correct Answer is:
B
The focal lengths of the concave mirror will not change as it does not depend upon the medium in which it is placed. But the focal length of the convex lens increases, when it is submerged in glycerine.
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