Does the Law of Reflection work for two reflections in a row?

1. Moving and rotating only the protractor, measure and record the angle of incidence and the angle of reflection at each mirror.

2. Move but do not rotate the mirrors so they are closer together. Measure and record the angles of incidence and reflection.

3. Rotate the first mirror to a new angle that still reflects the laser. Move the second mirror so that it still reflects the beam. Measure and record the angles of incidence and reflection.

To answer the questions pertaining to this experiment, click on the Questions button.

EXPERIMENT 1: Plane Mirrors/Standard Setup 2

Questions:

1. In Standard Setup 2, the angle of incidence of the top mirror is
a) 15 degrees
b) 25 degrees
c) 35 degrees
d) 45 degrees

2. The angle of incidence of the first mirror equals the angle of incidence of the second mirror
a) always
b) when the mirrors are far enough away from each other
c) when the mirrors are close enough to each other
d) when the mirrors are parallel to each other

3. For the first mirror, the angle of incidence equals the angle of reflection
a) always
b) when the mirrors are far enough away from each other
c) when the mirrors are close enough to each other
d) when the mirrors are parallel to each other

4. For the second mirror, the angle of incidence equals the angle of reflection
a) always
b) when the mirrors are far enough away from each other
c) when the mirrors are close enough to each other
d) when the mirrors are parallel to each other

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