Place paper over the top of the tube. Rotate the cover. Repeat for two different slit positions. Describe the arrangement of bulb, slit, and your eye that is necessary for you to be able to see the lighted bulb. B. Hold a dusty chalkboard eraser near the slit and strike the eraser several times.
People often speak of a beam of light.
This experiment should be performed in a darkened room. You will need construction paper, white paper, a flashlight, and a flashlight mask. Tape the mask to the front of the flashlight. Hold white paper above a white sheet of construction paper as shown. Aim the flashlight at the construction paper.