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Find the focal length:

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asked Nov 4, 2016 in Physics by Rahul Roy (7,895 points) ● 33 ● 108 ● 286
The refractive index of glass with respect to air is 1.53 and that of water with respect to air is 1.33. Then a convex lens whose focal length in air is 20cm when fully immersed in water will have the focal length x. Find x.

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answered Nov 5, 2016 by Abhishek Kumar (14,593 points) ● 5 ● 9 ● 35

Hint: Apply this and solve

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