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Ray Optics and Optical Instruments
Lens Maker's Formula and Power of a Lens
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- power of a biconvex lens
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2022 1 question
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A biconvex lens has radii of curvature, 20 cm each. If the refractive index of the material of the lens is 1.5, the power of the lens is :$R_1 = +20$ cm, $R_2 = -20$ cm, $\mu = \frac{3}{2}$ $P = \frac{1}{f} = (\mu - 1)\left(\frac{1}{R_1} - \frac{1}{R_2}\right)$ $P = \left(\frac{3}{2} - 1\right)\left(\frac{1}{0.2} + \frac{1}{0.2}\right) = \frac{1}{2}\left(\frac{2}{0.2}\right) = +5$ D