Question 63
Now do a test to see if your answers to question 1 were correct.
You will need the equipment shown in Figure 10.44: three flashlights of similar brightness; sheets of red, green and blue cellophane; elastic bands or tape; and a white wall or a large sheet of white paper.
Follow these steps. Record your observations after each step:
a Cover the lens of each flashlight with cellophane of a different colour (one red, one green, one blue) and secure it with elastic bands or tape (Figure 10.45). Make sure the room is dark enough to see the colours clearly on the wall or paper when you switch on the flashlights.
b Turn on one flashlight at a time and point it at the wall or paper. Observe and record the colour.
c Next, turn on two flashlights and overlap their light beams on the wall or paper. Observe and record the colour of light where the two colours of light overlap.
d Finally, turn on all three flashlights and overlap their beams. Observe and record the colour of light where the three colours of light overlap.
You will need the equipment shown in Figure 10.44: three flashlights of similar brightness; sheets of red, green and blue cellophane; elastic bands or tape; and a white wall or a large sheet of white paper.
Follow these steps. Record your observations after each step:
a Cover the lens of each flashlight with cellophane of a different colour (one red, one green, one blue) and secure it with elastic bands or tape (Figure 10.45). Make sure the room is dark enough to see the colours clearly on the wall or paper when you switch on the flashlights.
b Turn on one flashlight at a time and point it at the wall or paper. Observe and record the colour.
c Next, turn on two flashlights and overlap their light beams on the wall or paper. Observe and record the colour of light where the two colours of light overlap.
d Finally, turn on all three flashlights and overlap their beams. Observe and record the colour of light where the three colours of light overlap.
