Question

does the focal length of a lens change when it is completely immerged in water predict and write reason​

Answer 1

Answer:

No, the focal length doesn't change.

Answer 2

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.