A ray of light is sent along the line which passes through the point . The ray is reflected from the point on x-axis. If the reflected ray passes through the point then the coordinates of are
Let the reflected ray makes an angle with direction of x-axis, then the incident ray makes angle with positive direction of x-axis.
Now, the slope of the incident ray
Slope of the reflected ray is
From Eqs. (i) and (ii), we get
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