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MHT CET 2022 Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET 2022

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?

Answer: (D)

Solution

Lens-maker's formula for a lens in air: . For a double convex lens with equal radii and : , so .

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Question ID VK-093913