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Question

The refractive index of glass with respect to water is 98. Refractive index of glass with respect to air is 32. The refractive index of water with respect to air will be:

A
103
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B
43
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C
34
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D
35
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Solution

The correct option is B 43
Refractive index of glass w.r.t water,
wμg=98
μgμw=98
also, aμg=μgμa=32
Refractive index of water w.r.t air,
aμw=μwμa
aμw=μgμa×μwμg
aμw=32×1(98)
aμw=43
Hence, option (b) is the correct answer.
Why this question?
To understand the application of principle of reversibility in association with refractive index.

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