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A reflecting surface is represented by the equation
[IMAGE] A ray travelling horizontally becomes vertical after reflection. The
co-ordinates of points where this ray incident is

A$\left( \frac{L}{4},\frac{\sqrt{2}L}{\pi} \right)$B$\left( \frac{L}{3},\frac{\sqrt{3}L}{2\pi} \right)$C$\left( \frac{3L}{4},\frac{\sqrt{2}L}{\pi} \right)$D$\left( \frac{2L}{3},\frac{\sqrt{3}L}{\pi} \right)$

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The slope of curve at such points is

Source: Grass-G / P-14 Physics paper 7 Nov.docx