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A plano convex lens is made of glass of refractive index 1.5. The radius of curvature of its convex surface is R. Its focal length is

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A plano convex lens is made of glass of refractive index 1.5. The radius of curvature of its convex surface is R. Its focal length is
A. `400 cm`
B. `200 cm`
C. `100 cm`
D. `50 cm`
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Correct Answer - c
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