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The radii of curvature of a lens are + 20 cm and + 30 cm. The material of the lens has a refracting index 1.6.

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asked Mar 30, 2018 in Physics by Nisa (2,540 points) ● 1 ● 15

The radii of curvature of a lens are + 20 cm and + 30 cm. The material of the lens has a refracting index 1.6. Find the focal length of the lens (a) if it is placed in air, and (b) if it is placed in water (μ = 1.33).

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answered Mar 30, 2018 by rubby (7,550 points) ● 1 ● 3 ● 5
selected Apr 1, 2018 by Vikash Kumar
 
Best answer

=> f = 300 cm

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