If the reflected ray is making 30° with the surface, find the angle of incidence.

30 °

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60 °

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50 °

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90 °

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Solution

The correct option is B $60 °$
$W e k n o w b y t h e l a w o f r e f l e c t i o n, A n g l e o f i n c i d e n c e (∠ i) = a n g l e o f r e f l e c t i o n (∠ r) . T h e a n g l e o f n o r m a l w i t h t h e s u r f a c e i s 90 ° . T h e r e f l e c t e d r a y m a k e s a n a n g l e : 90 ° - 30 ° = 60 ° . a s, ∠ i = ∠ r T h e r e f o r e, t h e a n g l e o f i n c i d e n c e = 60 ° .$

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If the reflected ray is making 30° with the surface, find the angle of incidence.

The correct option is B 60°We know by the law of reflection, Angle of incidence(∠i) = angle of reflection(∠r).The angle of normal with the surface is 90°. The reflected ray makes an angle: 90° − 30°= 60°. as, ∠i = ∠rTherefore, the angle of incidence = 60°.