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Lens Maker's Formula

A plano-conve...

Question

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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Solution

f = $\frac{R}{μ - 1}$ = $\frac{R}{(1.5 - 1)}$ = 2R

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