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A beam of light is incident from air to water at an angle...

A beam of light is incident from air to water at an angle of 30 $^o$ . Find the angle of refraction if the refractive index of water is 4/3

A.

15 $^o$

B.

18 $^o$

C.

22 $^o$

D.

24 $^o$

View answer & explanation

Correct answer is C

X = $\frac{4}{3}$ r = ?

Shell’s law:. = $\frac{Sin i^0}{ Sin r^0}$

= $\frac{Sin 30^0}{Sin r^0}$

Sin $r^0$ = $\frac{3 Sin 30^0}{4}$

Sin $r^0$ = 0.375

R $^o$ = Sin-1 (0.375)

R $^o$ = 22.02 $^o$

R $^o$ = 22 $^o$

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