A plane wave y =a sin (bx + ct) is incid...

A plane wave `y =a sin (bx + ct)` is incident on a surface. Equation of the reflected wave is `y' = a' sin(ct-bx)`. Which of the following statements is not correct ?

The wave is incident on the surface normally

Reflecting surface is y-z plane

Medium, in which incident wave is travelling is denser than the other medium

a' cannot be greater than a

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ALLEN -WAVES AND OSCILLATIONS-Part-1(Exercise-01)

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