Two Flat Rectangular Mirrors Are Set Edge to Edge and Placed

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 $\degree$ .

Correct Answer:

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