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Consider an equiconvex lens of radius of curvature R and focal length f. if f > R, the refractive index µ of the material of the lens

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is greater than 1.5 but less than 2.0

is greater than one but less than 1.5

none of these

is greater than zero but less than 1.5

answer is C.

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Detailed Solution

$\begin{array}{l} \frac{1}{f} = (μ - 1) (\frac{2}{R}) or f = \frac{R}{2 (μ - 1)} \\ Now, f > R \\ ∴ \frac{R}{2 (μ - 1)} or \frac{1}{2 (μ - 1)} > 1 or 2 (μ - 1) < 1 \\ or μ - 1 < \frac{1}{2} or μ < (1 + \frac{1}{2}) or μ < 1 .5 \end{array}$

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