Question

Two plane mirrors are placed at an angle of 60° to each other with a coin between them. Using n = \frac{360^\circ}{\theta} - 1, find the number of images of the coin seen.

Two plane mirrors M1 and M2 are joined at right angles, as shown in the figure. A ray strikes M1 at P with an angle of incidence of 30°, is reflected to M2 at Q and is reflected again. Find the angle of reflection (in degrees) at M2.