Three plane mirrors are arranged along three sides of a square. A ray of light is incident on the left side mirror at its midpoint with an angle of incidence of

Three plane mirrors are arranged along three sides of a square. A ray of light is incident on the left side mirror at its midpoint with an angle of incidence of 40 so that the ray is reflected by other mirrors. Draw the appropriate path of the ray and calculate the angle through which the ray is turned at each of the three reflections ​