A concave mirror is half dipped in water focal length of portion of mirror in the air is f1 and focal length of mirror in water is f2 then
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The focal length of the mirror will be f1 = f2
- The concave mirror is half dipped in water having focal length as f1.
- The concave mirror is half in air having focal length as f2
- In the case of spherical mirrors (both concave and convex), when immersed in water there will be no change in the focal length of the mirrors.
- This is due to the reason that the mirror focal length does not focus on the external medium it is kept in.
- Thus, the focal length will be f1 = f2
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