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A reflecting surface is represented by t...

A reflecting surface is represented by the equation
`y = (2L)/(pi) sin ((pi x)/(L))`, where `0 le x le L`. A ray of light travelling horizontally becomes vertical after reflection with the surface. The co-ordinates of the point where this ray is incident is.

A

`((L)/(4),sqrt(2L)/(pi))`

B

`((L)/(3),sqrt(3L)/(pi))`

C

`((3L)/(4),sqrt(2L)/(pi))`

D

`((2L)/(3),sqrt(3L)/(pi))`

Text Solution

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The correct Answer is:
B
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