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JEE PHYSICS MCQ: RAY OPTICS

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A plano convex lens is made of glass of refractive index

\mathrm{1}\mathrm{.5}

. The radius of curvature of its convex surface is R. Its focal length is

View answer and explanation

Correct option: C

2\,R

Option C (

2R

) is correct because the focal length of a plano-convex lens with refractive index 1.5 is twice the radius of curvature.

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