Objective: To demonstrate how individual pieces of data combine to produce complete images.
Materials:
Paper tube (mailing tube, tube
from a roll of wrapping paper, a
paper towel roll center, etc.) Procedure: 1. Trace one end of the tube on the opaque paper and cut out the circle. 2. Use the ruler to draw a straight line directly across the circle. 3. Cut out the circle and cut it in half along the straight line. 4. Tape each half of the circle on to one end of the tube leaving only a narrow slit about 2 mm wide. 5. Look through the other end of the tube. Try to make out the image of what you see. Slowly move the tube from side to side. Gradually increase the speed of the tube's movement. Discussion: This activity is a companion to the Magic Wand activity. By slowly moving the tube from side to side, small fragments of the outside world appear through the narrow slot. Each fragment quickly blurs as the tube moves. Like in the Magic Wand activity, a more rapid movement of the tube permits the eye's property of persistence of vision to help the viewer construct a complete mental image of the outside |
scene. Refer to the Magic Wand activity for more details.
Note: The tube and paper slit
used here can also be used with the Simple
Spectroscope activity (Unit 2) by mounting
the diffraction grating over the open end.
Note: A much simpler version of this activity
requires a 10 by 10 centimeter square of For Further Research:
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