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yukcream

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Q2. A parabolic reflector has the property that a light source placed at its focus produces a parallel beam, or, conversely, parallel rays converge at the focus. Assuming that reflection of light from a curve is determined by the usual laws of reflection for the tangent to the curve at the point of incidence (angle of incidence equals angle of reflection), use the above property to determine a differential equation for the parabola.