A concave mirror and a convex lens are held separately in water. What changes, if any, do you expect in the focal length of either?
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Focal length of any mirror does not depend on any medium. So i will be not affected. If refracted index of material of convex lens is greater than that of water, then its focal length will increase. If refractive index of material of convex is equal to that of water, then its focal length will become infinity. If refractive index of material of convex is less than that of water, then its focal length will become negative. It will act like concave lens.
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