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Q.

A glass biconvex lens of radii of curvature 50 cm and 100 cm, with its latter face silvered is placed in air. The refractive index of glass is 1.5. What is the power of the optical system of image in diopter ?

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answer is 5.

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Detailed Solution

$p = \frac{1}{f} = 2 (μ - 1) (\frac{1}{R_{1}} - \frac{1}{R_{2}}) - \frac{2}{R_{2}} p = 5 D$

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