Two plane mirrors M M2 have their reflecting faces inclined at 0 Mirror M receives a ray AB reflects it at B and sends it as BC

Question

Two plane mirrors M M2 have their reflecting faces inclined at 0 Mirror M receives a ray AB reflects it at B and sends it as BC It is now reflected by mirror M along CD as shown in the figure Total angular deviation suffered by the incident ray AB is 0 B Z TTTTI O 890 20 C 82 D M2 A

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