to verify the laws of reflection
soft board, optical pins, plane mirror, protractor and a plane sheet of paper.
Draw a line to mark the silvered surface of the mirror on the sheet of
Mark a point X on the line.
Draw a normal
Using a protractor mark off an angle of incidence, e.g.
200 and draw the incident.
Stand the mirror
vertically on the line representing the silvered surface.
Tuck pins P1 and P2 in the incident ray.Note:
P1 and P2 should stand vertically and far a part.
your eye at E to view the reflections of P1 and P2.
in P3 such that the images of P1, P2, and P3 appear to be in a straight line.Move
your eye side ways to ensure there is no relative movement (no-parallax) between
images of P1 ,P2 and P3 .
- Repeat procedure (ix)
above with another pin P4.
- Join P3 and P4. It
should cross the silvered line at X.
the angle of reflection, r.
Repeat procedures (iv)
to (xii) for angles I = 300, 400, 500, 600, 700
Tabulate your results in the
What do you observe? (Generally, the angle
of incidence is equal to the angle of reflection)