when a lens is dipped in water itd power change. why?
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Answer:
The focal length of lens changes when submerged in water. It is because lens worked on refraction phenomenon. Angle of refraction depends on the index of refraction medium from which light incident.
Explanation:
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. For a lens in air n(incident) is close to one. For water it is 1.33 or so.
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