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double -convex lens is to be manufac...

double -convex lens is to be manufactured from a glass of refractive index 1.55 with both faces of the same radius of curvatures . Calculate the radius of curvature required if the focal length is to be 20 cm ? Also find the focal length of the lens if it is immersed in water of refractive index 1.33 ?

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OSWAAL PUBLICATION-2018 Solved Paper II-Exercise
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