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Question

A convex lens of glass (μ=1.5) is immersed in water. Compared to its power in air, its power in water-

A
increases
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B
decreases
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C
remain same
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D
nothing can be predicted
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Solution

The correct option is B decreases
From lens makers formula we have
1f=(μlensμmedium1)(1R11R2)
It is given that μa=1 and μw=43=1.33.
Hence μa<μw
μgμa>μgμw
1fa>1fw
Or power Pa>Pw.
Hence the correct answer is option (B) Decreases.


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