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 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
(b) become infinite
(c) become small, but non-zero
(d) remain unchanged
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Correct option (b) become infinite
Explanation:
When refractive index of lens is equal to the refractive index of liquid, the lens behave like a plane surface with focal length infinity.
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