The velocity of light in air is `3xx10^(8)ms^(-1)` and that in water is `2.2xx10^(8)ms^(-1).` Find the polrising an gle of incidence.
The velocity of light in air is `3xx10^(8)ms^(-1)` and that in water is `2.2xx10^(8)ms^(-1).` Find the polrising an gle of incidence.
A. `45^(@)`
B. `50^(@)`
C. `53.74^(@)`
D. `63^(@)`
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Correct Answer - C
The refractive index of water
`mu=("speed of light in air")/("speed of light in water")=(3xx10^(8))/(2.2xx10^(8)=1.36`
From Brewsters law, ` "tan" i_(p)=mu=1.36`
` :. i_(p)="tan"^(-1)(1.36)=53.74^(@)`
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