Hold an index card with a hole in it near a viewing surface, and you’ll probably see the spot of light in the shape of the hole. What shape does it make? How does it compare with the shape you created on the mirror? Move closer and farther away from the surface to see if it changes. Reflect the mirror’s light onto the dark-colored surface. Use masking tape to block off all but a small section of the mirror in any shape you choose, as in the photo below (click to enlarge). How does the image of the Sun compare with the shape of your mirror? Move closer and farther away from the surface to see if it changes. Tilt the mirror so it reflects the Sun onto a dark-colored surface, such as a wall in the shade or a dark posterboard (click to enlarge photo below). Make sure no one is in front of the mirror, and do not point the mirror toward anyone’s eyes or face, including your own. How does the image of the light change as you move closer and farther away from the viewing surface?Ĭaution: It’s dangerous to have sunlight reflected directly into your eyes. How does it compare with the hole punch? How does the shape of the image compare with the shape of the hole? How does the image of the light change as you move closer and farther away from the viewing surface?Įxperiment with other shapes and sizes of holes, such as a square, a triangle, or an irregularly shaped hole. Now use a pencil to punch a hole in a new index card (click to enlarge the photo below). What is the shape of the spot of light that shines through? Orient the card so you can see the sunlight coming through the hole. On a sunny day, hold the card so you can see its shadow on a light-colored surface, such as a posterboard placed on the ground. Use the hole punch to cut a hole in an index card. With this Snack, you can safely investigate the Sun by looking at its image.
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