A lens made of glass of refractive index 3/2 has a focal length 20cm in air.calculate the focal length of the lens,when it is immersed in water(n=4/3)
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A convex lens made of glass of refractive index 1 . 5 is dipped in ...
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A convex lens made of glass of refractive index 1 . 5 is dipped in ...
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