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A light ray emerging from a point source at $A (2, 3)$ is reflected on the y axis at point $B$ and passes through the point $C (5, 10)$ then the coordinates of $B$ are

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$(2, 0)$

$(5, 0)$

$(0, 5)$

$(0, 2)$

answer is B.

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Detailed Solution

Let $(o, y)$ be the point of reflection , Angle of incidence= Angle of reflection
Question Image
$\Rightarrow M_{1} = M_{2} \Rightarrow \frac{y - 3}{- 2} = \frac{y - 10}{5} \Rightarrow y = 5$
Req point $= (0, 5)$

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