Does focal length of a mirror depend on medium it is placed in?
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Focal length of a mirror does not depend on the medium in which mirror is held. It depends on the radius of the sphere from which it is made.
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The focal length of a mirror is a constant quantity. It does not change with medium nor does it depend on the refractive index of a medium. Hence, the focal length of the mirror in air is equal to the focal length of the mirror in the water. is your answer
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