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Question

A ray of light is incident on a glass-water interface at an angle i, it merges finally parallel to the surface of the water as shown in the figure, the value of μg would be:


A

(4/3) sin i

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B

1 /sin i

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C

4/3

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D

1

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Solution

The correct option is B

1 /sin i



By applying snell's law

At first surface: (glass to water)

sinisinr=absolute refractive index of waterabsolute refractive index of glass=μωμg=43μg ....(1)

A second surface: (water to air)
sinisinr=absolute refractive index of airabsolute refractive index of water
sinr=1μω=34 ....(2)

substituting this value in (1)

4sini3=43μg

μg=1sini


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