9.7 Double-convex lenses are to be manufactured from a glass of refractive index 1.55

PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

9.7 Double-convex lenses are to be manufactured from a glass of refractive index 1.55 , with both faces of the same radius of curvature. What is the radius of curvature required if the focal length is to be 20 cm ?

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