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MHT CET 2026 Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET 2026

A convex lens having refractive index 1.6 has focal length 12 cm, when it is in air. The focal length of that lens when placed in water is (refractive index of water = 1.28)

Answer: (B)

Solution

Lens-maker's formula: . In air: . In water: , so .

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Question ID VK-099023