6. (a) State two laws of reflection of sound.
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1) The angle of reflection is always equal to the angle of incidence .
2) The reflected sound , the incident sound and the normal sound belong in the same plane.
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The following two laws of reflection of light are applicable to sound waves as well: The incident wave, the normal to the reflecting surface and the reflected wave at the point of incidence lie in the same plane. The angle of incidence ∠i is equal to the angle of reflection ∠r.
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