A concave mirror and a convex lens held in water . What changes, if any, do you expect in their focal lenght?
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Focal length of any mirror (concave) does not depend on medium, so it remains unchanged. If refractive index of the material of convex lens is greater than that of water, then its focal length will increase.The minimum distance between the object and its real image is 4f, where f is focal length.
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