STANDARDPhysics-Optics
STANDARD Physics Lenses MCQ Question
Type: MCQ-conceptual-Medium-Class 12
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
Correct Answer
Option B
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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