The reflecting surface is represented by the equation \( 2 x=y^{2} \) as shown in figure. A ray ...

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The reflecting surface is represented by the equation \( 2 x=y^{2} \) as shown in figure. A ray travelling horizontal becomes vertical after reflection. The co-ordinates of the point of incidence can be:
(a) \( (1 / 2,1) \)
(b) \( (1,1 / 2) \)
(c) \( (1 / 2,1 / 2) \)
(d) \( (1 / 2, \pm 1) \)
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