what change do you except in the focal length of a concave mirror and a convex lens, when immersed in water
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Focal length of the concave mirror does not change because it is about half its radius of curvature and has nothing to do with the external medium. On the other hand, the focal length of the convex lens will increase because refractive index of glass with respect to water is less than refractive index with respect to air.
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