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MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

A glass convex lens is of refractive index 1.55 with both faces of same radius of curvature. What will be the radius of curvature if focal length is to be 20 cm? [MHT-CET 2023]

Answer: (D)

Solution

gives cm; 18, 21

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Question ID VK-069443