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If a spherical mirror is dipped in water, does its focal length change ? 17. If a thin lens is dipped in water, does its focal length change ?

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If a spherical mirror is dipped in water, does its focal length change ? 17. If a thin lens is dipped in water, does its focal length change ?
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There would be no change in focal length of the concave mirror held in water as `f` does not depend upon the external meduim in which mirror is held.
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