The focal length of convex lens (approximately) if refractive index 2 and radius of curvature respectively are 20cm and - 45cm. [ ] А 91 cm B 19 cm C 23 cm D 32 cm
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The radius of curvature of a double concave lens is 20 cm. If the refractive index of glass with respect to air is 5/3 then, the focal ...
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