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Question
A concave mirror and convex lens are held in water. What changes, if any, do you expect in their focal length?
Solution
The focal lengths of a mirror does not depend upon the nature of the medium in which it is placed whereas the focal length of a lens depends upon the medium in which it is placed. Thus there will be no change in the focal length of the concave mirror whereas the focal length of the convex lens will change.
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