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Find the focal length:

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in Physics by (6.3k points)
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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1 Answer

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by (9.4k points)

Hint: Apply this and solve

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