Physics Experiments in Your Own Light Box by Robert Gardner

Author:Robert Gardner
Language: eng
Format: epub
Publisher: Enslow Publishing, LLC

1.Hold a convex lens near a wall on the opposite side of a room from a window. Move the lens closer to and farther from the wall until you see a clear image on the wall. This a real image. The image is really on the wall. It is not a virtual image like the kind you see in a plane mirror. Is the image right side up or upside down?

2.Ask an adult to light a candle in a dark room. Hold the convex lens a meter (yard) or so from the candle. Ask a partner to hold a white cardboard screen on the other side of the lens from the candle. Have your partner move the cardboard screen until a clear image of the candle appears on the screen.

3.Move the lens closer to the candle. How does this affect the size of the image? How does it affect the distance between the lens and a clear image?

4.Move the lens farther from the candle. How does this affect the size of the image? How does it affect the distance between the lens and a clear image?

5.To make a simpler image, replace the bulb in the light box with a 60-watt frosted bulb. Put the cover back on the light box. Then pull a plastic sandwich bag over a basic mask frame. Using a felt-tip pen, draw an upright arrow on the plastic at the center of the mask. Put the mask with the arrow over the opening in the light box.

6.Darken the room and turn on the lightbulb in the light box. Hold the white cardboard screen and a convex lens in front of the arrow. Move the lens and cardboard screen different distances from the mask until you get a sharp image of the arrow on the cardboard screen. Is the image upside down? How can you test to see if the image is reversed right for left?

7.If you move the lens farther from the arrow, what happens to the size of the arrow’s image? What happens to the distance between the lens and the cardboard screen? What happens if you move the lens closer to the arrow? Is the image bigger? Is the distance between the lens and the cardboard screen greater? If you hold the lens very close to the arrow, can you still make an image?

IDEA FOR YOUR SCIENCE FAIR

How do you think a concave lens bends light? Do an experiment to find out.

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