Question

A student while verifying the laws of reflection of sound measured the angle between the incident sound wave and reflected sound wave as 120°. What is the angle of incidence.
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Answer 1

60° since in reflection angle i = angle r
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Answer 2

Since the normal makes an of 90 with the plain therefore,

Let angle between incident ray and plain be Xmas

Angle of incidence=(90-X)

Angle of refraction=(90-X)

Acc to question

90-X+90-X=120

180-2X=120

-2X=120-180

-2X= -60

Minus sign will get cancelled

2X=60

X=60÷2

X=30

Angle of incidence =(90-X)

=90-30

=60

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