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CGP EDU Academic Team
Published on: August 13, 2026
A ray of light is coming along the line y = b from the positive direction of x-axis & strikes a concave mirror whose intersection with the xy plane is a parabola y 2 = 4ax. Find the equation of the reflected ray & show that it passes through the focus of the parabola. Both a & b are positive.
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Sol. 4abx + (4a 2 – b 2 ) y – 4a 2 b = 0
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