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Radius of curvature of Plano-Convex lens is 10 cm and Focal length of lens is 30 cm. Then refractive index of material of lens is:-

A

$1.65$

B

$1.55$

C

$1.33$

D

$1.25$

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Solution

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Correct option is C)

$R_{1} = \infty R_{2} = - 10 c m$
$We know, \frac{1}{f} = (n - 1) (\frac{1}{R _{1}} - \frac{1}{R _{2}}) \Rightarrow \frac{1}{3 0} = (n - 1) (\frac{1}{1 0}) . \Rightarrow n = 4 / 3 = 1.333$

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