How do you verify the 1st law of reflection of light with an experiment? (AS3)

First law : The angle of incidence is equal to the angle of reflection (i = r).

Objective: To prove first law of reflection

Required Materials: mirror strip, soft board, white paper, protractor, pencil, pins, Ruler

Procedure:

1. Affix the white sheet on the board with the help of 4 pins.

2. Place the mirror strip on the paper & trace its edges.

3. Draw a line perpendicular to the edge of the mirror so that it can act as a normal.

4. Draw an angle i = 30 degree with respect to the normal which will act as an angle of incidence . Place the pins P & Q on this line.

5. Place your eye to the line coinciding with the image of the incident line and place the pins R & S.

6. Remove the pins R & Q and join the dots.

7. Measure the angle with respect to the normal. This angle will be angle of reflection r.

8. Repeat the experiment with angles I = 45-degree, 50 degree.