55. The angle at which light strikes a mirror is equal in measure to the angle at which it is reflected. In the hall of the mirrors below, what is the measure of the indicated angle?

Answer and Explanation

Your Answer is

Correct Answer is C

Explanation

The left refraction angle is 180° -(180° -40° -90°) -75° = 55°, then the left refraction angle plus the angle between the two refraction angles is 55°+ (180°-2×55°) =125°. According to the internal angle of the quadrilateral and 360 degrees, it can be known that the unknown angle is 360° -90°- 75°-125°= 70°, so choose C