A ray of light strikes a plane mirror at a 45° angle of incidence. The mirror is then rotated by = 15° into the position shown in red in the drawing, while the incident ray is kept fixed.
(a) Through what angle does the reflected ray rotate?
(b) What is the answer to part (a) if the angle of incidence is 60° instead of 45°?
anyone who can go through this one please.