By Allan B. Cobb
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Additional info for Super science projects about light and optics
Page 42 Analyzing Your Results #1 Why do you think the white paper was used as a screen to determine where the image was located? #2 Why do you think you want a low-powered objective lens? #3 How could you make the image that you see larger? #4 What do you think would happen if you used the magnifying glass as the objective lens and the reading glasses as the eyepiece? Try it and find out. Page 43 For Further Investigation #1 With the paper in place, measure the distance from the objective lens to the screen and between the screen and the eyepiece.
Reading glasses (drugstore reading glasses; choose a pair with low numbers) · A magnifying glass · A lamp · Masking tape · Wax paper or thin typing paper Page 40 What You'll Do #1 Tape the reading glasses to the back of a chair. Make sure that one lens sticks out beyond the chair. This lens will serve as the objective lens for your telescope. #2 Place the chair with the objective lens 12 feet (4 m) from the lamp. Turn on the lamp and turn off all other lights in the room. #3 Hold up the sheet of paper in front of the objective lens (on the side opposite the lamp) to serve as a screen.
If you do not succeed the first time, continue trying. Is it easier to drop marbles into the cup when looking directly down or at an angle? #5 While still looking at the aquarium at an angle, hold a marble just under the surface of the water and try to drop it into the coffee cup. Is this easier or harder than the other ways you have tried? Analyzing Your Results. #1 Based on your observations of the pencil in the glass and dropping the marble into the coffee cup in the aquarium, how can you explain what happened with the coin in the coffee cup?