11. A beam of laser is emitted from the point $(3,5)$, the light is reflected by the $y$-axis and then reflected by the $x$-axis, passing through the point $(7,5)$. The sum of the distances the light travels is ( ).
(A) $2 \sqrt{10}$
(B) $5 \sqrt{2}$
(C) $10 \sqrt{2}$
(D) $15 \sqrt{2}$
(E) $10 \sqrt{5}$
11. C.

The light path is as shown in Figure 9.
Thus, the point $A(3,5)$ symmetric to the $y$-axis is $A^{\prime}(-3,5)$, and the point $B(7,5)$ symmetric to the $x$-axis is $B^{\prime}(7,-5)$.
Therefore, $\left|A^{\prime} B^{\prime}\right|$
$$
\begin{array}{l}
=\sqrt{(-3-7)^{2}+(5-(-5))^{2}} \\
=10 \sqrt{2} .
\end{array}
$$