Two flat mirrors make an angle of $90.0^{\circ}$ with each other, as diagrammed at right. An incoming ray makes an angle of $35^{\circ}$ with the normal of mirror $\mathrm{A}$.
Use the law of reflection to determine the angle of reflection from mirror B. What is unusual about the incoming and reflected rays of light for this arrangement of mirrors?
(FIGURE CANT COPY)