Two plane mirrors are held at right angles, which implies they are inclined at a 90-degree angle, according to the query.
When 360/90 = 4 is an even number, we know it. (360/901)=3 would be the number of images.
The comb would be in the man’s left hand in the first two photographs. The comb is held in the right hand of the picture that emerges in between those two photos. As a result, there will be photographs in which he will be seen utilising his right hand.