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20. Two plane mirrors are inclined to each other at an angle 70° as shown in figure. A ray of light PO incident at some angle i on the mirror M, falls after reflection from it, on the other mirror M, from which it gets reflected along a direction parallel to the plane mirror M. Find the value of i. M2 op A REDMI NOTE 5 PRO MI DUAL CAMERA 320 2019/7/7

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