What happens to the focal length of a concave lens when it os immersed in water?
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focal length depends upon refractive index of lens with respect to medium. hence, after immersing of lens in water focal length of lens increases. A convex lens made of glass is immersed in water.As a result,its focal length will increase
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when concave lens immersed in water the focal length of lens increases because focal length of lens is directly proportional to refractive index of medium and when immersed in water the medium become more dancer so its focal length increases.
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