Question

A point source is placed at co-ordinates $(0,1)$ in X-Y plane. A ray of light from the source is reflected on a plane along the X-axis and perpendicular to the X-Y plane. The reflected ray passes through the point $(3,3)$. What is the path length of the ray from $(0,1)$ to $(3,3)$?

• A. $5$
• B. $\sqrt{13}$
• C. $2\sqrt{13}$
• D. $1+2\sqrt{3}$

Answer 1

Answer: (A)

$5$

$a=\sqrt{3^2+4^2}=5$.