A plane wave $y = a s i n (b x + c t)$ is incident on a surface. Equation of the reflected wave is $y^{'} = a^{'} s i n (c t - b x)$ Which of the following statement is not correct?

The wave is incident on the surface normally.

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Reflecting surface is y-z plane.

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

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a' cannot be greater than a.

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Solution

The correct options are
A The wave is incident on the surface normally.
B Reflecting surface is y-z plane.
C Medium, in which incident wave is travelling , is denser than the other medium.
D a' cannot be greater than a.

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