Q

A convex mirror of focal length f in air is immersed in a liquid of refractive index 4/3. What is its focal length in the liquid?

RRB ALP & Technician 09/08/2018 / Shift-I 2018
✓ Answer: B (4/3)f
Source key: B, retained. For a mirror, focal length depends on curvature and remains f, so option D is correct. The printed explanation incorrectly discusses a lens.
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