A ray of light is coming along the line ...

A ray of light is coming along the line `y=b` from the positive direction of x-axis and striks a concave mirror whose intersection with xy-plane is a parabola `y^2 = 4ax`. Find the equation of the reflected ray and show that it passes through the focus of the parabola. Both `a and b` are positive.

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The correct Answer is:

S(a,0)

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