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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 is the radius of curvature required if focal length is to be 20 cm? [MHT-CET 2019]

Answer: (B)

Solution

gives cm; 20 cm, 18 cm and 21 cm give other focal lengths. Hence the correct option is (b).

Question ID VK-069522