What is the angle of incidence if a reflected wave bounces off a mirror with an angle of reflection equal to 55 degrees?

Answer;

55 degrees

Explanation; The angle of incidence is 55 degrees as the angle is equal to the bouncing or reflection angle. That is; Angle of incidence = angle of reflection. The angle of incidence is the angle between the incident ray and the normal while the angle of reflection is the angle between the reflected ray and the normal. According to the law of reflection, when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.