A ray of light moving parallel to the x-axis gets reflected from a parabolic mirror whose equation is . After reflection, the ray must pass through the point
The equation of the axis of the parabola is , which is parallel to the x-axis. So, a ray parallel to x-axis is parallel to the axis of the parabola. We know that any ray parallel to the axis of a parabola passes through the focus after reflection. Here (0,2) is the focus.
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