Question

2 vertical plane mirrors are inclined at an angle of 60°

Answer 1

https://www.quora.com/2-vertical-plane-mirrors-at-inclined-at-an-angle-60-with-each-other-A-ray-of-light-travelling-horizontally-is-reflected-first-from-one-mirror-and-then-from-other-find-the-resultant-deviation