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Question

Find the refractive index of glass with respect to water. The refractive indices of glass and air with respect to air are 3/2 and 4/3 respectively.

A
2/1
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B
1/2
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C
9/8
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D
8/9
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Solution

The correct option is B 9/8
Refractive index of medium 1 with respect to medium 2, 1μ2=μ2μ1
Refractive index of glass with respect to air, gμa=32

Refractive index of water with respect to air,wμa=43
gμa=μaμg

wμa=μaμg

refractive index of glass with respect to water, gμw=μwμa×μaμg=gμawμa=32×34=98

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