How focal length of lense change with change in medium?
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The formula
f=c2
where c is the radius of curvature is for mirrors, not lenses.
The reason you are getting a wrong result is that you are applying a formula designed for mirrors to a lens.
Incidentally, the formula f=c2 is still valid for mirrors underwater.
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Answer:
The focal length of a lens is very much affected when immersed in water. The reason is that the angle of refraction is dependent on the relative difference between the indices of refraction of the incoming medium and the medium of the lens. ... Your eyes' focal length change dramatically.
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