At what angle from horizontal must we keep the mirror in order to get a vertical reflected ray

Text Solution

Solution :  To make the reflected ray vertical, it should be rotated through and angle of `60^(@)`, So, the mirror should be tilted by `60^(@)//2=30^(@)` , as shown in Fig (b). <br> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/BMS_V04_C01_S01_004_S01.png" width="80%">