NEET 2003 Physics question

Physics Ray Optics and Optical Instruments NEET 2003

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

(1)Become zero
(2)Become infiniteCorrect
(3)Become small, but non-zero
(4)Remain unchanged

Answer: (2)

Solution

Lens-maker's formula in a medium: . When the relative index is 1, so $

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Question ID VK-089148