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  • A biconvex lens has radii of curvature, each. If the refractive index of the material of the lens is 1.5, the po

A biconvex lens has radii of curvature,20 \mathrm{~cm} each. If the refractive index of the material of the lens is 1.5, the power of the lens is
 

Option: 1

+ 20 \mathrm{ D}


Option: 2

+5 \mathrm{ D}


Option: 3

infinity


Option: 4

+2\mathrm{D}


Answers (1)

best_answer

\begin{aligned} \begin{array}{l} R=20 \mathrm{~cm} \\ \mu=1.5 \end{array} \end{aligned}

\begin{aligned} &\frac{1}{f}=(\mu-1)\left ( \frac{1}{(+R)}-\frac{1}{(-R)}\right ) \\ &\frac{1}{f}=\frac{2(\mu-1)}{R}=\frac{1}{R}=\frac{1}{+R}=\frac{1}{20 \mathrm{~cm}}=+5 D \end{aligned}

The power of the lens is 5 D

The correct option is (2)

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manish

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