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If in a plano-convex lens, the radius of curvature of the convex surface is $10 \mathrm{~cm}$ and the focal length of the lens is $30 \mathrm{~cm}$, then the refractive index of the material of lens will be
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The correct answer is:
1.33
$f=\frac{R}{(\mu-1)} \Rightarrow 30=\frac{10}{(\mu-1)} \Rightarrow \mu=1.33$.
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