STANDARD Physics Lenses MCQ Question
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
become zero
become infinite
become small, but non-zero
remain unchanged
Correct Answer
Detailed Explanation
When the refractive index of the lens is equal to the refractive index of the liquid, the lens behaves like a plane surface with focal length infinity.
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