Question 11
Work in pairs to do this experiment about how light travels through different media (materials). You will need a container made of clear glass or clear plastic, a laser pointer or flashlight, a piece of white paper or cardboard and water (Figure 10.12). You may also use a few drops of milk. Work in a dimly lit room. Fill the container with water. You can add a few drops of milk to the water to make the light beam more visible. Shine the light through the side of the container so that the beam passes through the water before hitting the paper. Observe how the light beam bends when it enters the water, travels in a straight line through the water, and then bends again as it goes back into the air.
