The law of reflection states that if the angle of incidence is 56 degrees, the angle of reflection is degrees.

The law of reflection states that "the angle of incidence is equal to the angle of reflection" , provided the reference line is the normal. But ,since we require the angle from reflecting surface , the angle with reference to normal is 34º equals 90-34 = 56º with respect to the reflecting surface.

2. they have negligible mass.