Fewpal
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in Physics by (667 points)

 A glass lens is immersed in water. How is the power of the lens affected

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1 Answer

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For a glass lens in air, n2=1.5, n1=1

For a glass lens in water: n1=1.33

so

let: (1/R1)-(1/R2)=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

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