A light ray emerging from the point source placed at
Question:

A light ray emerging from the point source placed at $\mathrm{P}(1,3)$ is reflected at a point $\mathrm{Q}$ in the axis of $x$. If the reflected ray passes through the point $\mathrm{R}(6,7)$, then the abscissa of $\mathrm{Q}$ is :

1. 3

2. $\frac{7}{2}$

3. 1

4. $\frac{5}{2}$

Correct Option: , 4

Solution:

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