2 plane mirrors M1 and M2 are inclined at angle theta. A ray of light 1 which is parallel to strikes M2and after 2 reflection ,the ray to becomes parallel to M2.Find the angle theta​

Dear student,
Given two mirror are inclined.

Here M1OM2 = DCM2=θM1BA=M1OM2=θα=90°-θx=90°-αx=90°-90°-θx=θSimilarlyβ=90°-θy=90°-βy=90°-90°-θy=θSo all angle x, y and θ are equal BOC is equilateral triangle.θ=60°
 

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