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

Asked by Pramesha Biswas | 5th Sep, 2012, 08:53: PM

Expert Answer:

For a glass lens in water:n1=1.33
so
let:=X
 
 
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

Answered by  | 6th Sep, 2012, 12:29: PM

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