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Question

If a source of light is placed at the focus of a parabola & if the parabola is a reflecting surface, then the ray reflected off the parabola bounces back in a line parallel to the axis of the parabola.
On the basis of above information answer the following question
A ray of light is coming along the line y=4 from the positive direction of xaxis & strikes a concave mirror whose intersection with the plane XOY is a parabola y2=16x, then equation of reflected ray is

A
3x+2y=16
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B
4x+3y=16
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C
5x+4y=9
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D
None of these
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