If in a plano-convex lens, the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm , then the refractive index of the material of lens will beA. 1.5B. 1.66C. 1.33D. 3

If in a plano-convex lens, the radius of curvature of the convex surfa

1.	If in a plano-convex lens, the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm , then the refractive index of the material of lens will beA. 1.5B. 1.66C. 1.33D. 3
Answer» Correct Answer - C (c ) we have, `1/f=(mu-1)(1/R_(1)-1/R_(2))` `1/30=(mu-1)(1/10)` The refractive index of the material of the lens `mu=4/3=1.33`

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If in a plano-convex lens, the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm , then the refractive index of the material of lens will beA. 1.5B. 1.66C. 1.33D. 3

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