In this experiment, we will make a simple device that produces side-by-side light beams. By observing the behaviour of these beams, you’ll be able to learn more about the properties of light.
Things Required:
Index card
Comb
Pair of scissors
Tape
Torch
Mirror
Clay
Directions:
To construct a “ray maker,” cut a rectangular opening in the centre of the long edge of an index card. Use tape to secure a comb over this opening. Try to position the teeth of the thicker comb in the opening. Bend back the side edges of the card so that it may stand freely.
Secure a mirror with a small lump of clay. Set the upright mirror in the centre of a table. Place the ray maker several inches from the mirror.
Flip on your torch. Aim the light beam through the teeth of the comb so that the light may strike the mirror. Observe what happens to these beams as they reflect off the surface of the mirror. Do the beams change direction? How does the angle at which they strike the mirror compare to the angle at which they reflect off the surface of the mirror?
This Is What Happens:
Light that travelled through the openings between the comb teeth formed visible beams. These beams struck the surface of the mirror and were reflected. By examining the beams and their reflections, you can uncover how light behaves when it strikes a mirror.
Magical Word: Save this ray-making tool! You’ll need it for several other experiments.
