Wed September 05, 2012 By: Pramesha Biswas

A glass lens is immersed in water. How is the power of lens affected? Justify your answer.

Expert Reply
Thu September 06, 2012
For a glass lens in water:n1=1.33
1/f in water =(1.5/1.33  -1)X
            nearly =1/4 X
so the focal length of the lens becomes 4 times when immersed in water.
so power becomes 1/4 th
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