Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface.A light ray that reflects from mirror 1 at angle $\theta$ _M₁ then strikes the second mirror and reflects at $\theta$ _M₂ such that the angle between the ray reaching mirror 1 and the ray leaving mirror 2 is 180 $\degree$.The angle between the two mirrors is A)0 $\degree$. B)45 $\degree$. C)90 $\degree$. D)150 $\degree$. E)235 $\degree$.

Question

Quizplus · Accepted Answer

Since the angles of incidence and reflection are equal and the angle between the incoming and outgoing rays is 180F1F1F1S1F1F1F10, the mirrors must be perpendicular to each other. Therefore, the answer is choice C: 90F1F1F1S1F1F1F10.

Two Flat Rectangular Mirrors Are Set Edge to Edge and Placed