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Q.

A beam of light is partially reflected and partially refracted from a surface. The angle between reflected and refracted light rays is 90^o. If the angle of refraction is 30^o. The angle of incidence is

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a

60^o

b

48^o

c

45^o

d

90^o

answer is A.

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Detailed Solution

Question Image

$\begin{array}{l} r + 90 + 30 = 180^{\circ} \\ r = 180 - 120 = 60^{\circ} \end{array}$
For reflection i = r
$∴$ r = 60^o

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