Q135 / 200 · NEET 2003 · Physics

A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will:

A
become zero
Correct answer
B
become infinite
C
become small, but non-zero
D
remain unchanged

Solution

When refractive index of lens is equal to the refractive index of liquid, the lens behave like a plane surface with focal length infinity.

Hence, the correct answer is option: 'B'.

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