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Refraction at Curved Surfaces

What will be ...

Question

What will be the behaviour of a lens, if it is placed in water instead of air?

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Solution

Focal length depends upon the refractive index of the material of the lens with respect to the medium surrounding it. Since the surrounding medium changes from air to water, the refractive index decreases and so the focal length of the lens increases.

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Q. A convex lens made up of glass

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