Having children work in small groups or pairs may also be helpful. Setting boundaries around turn taking, assigning roles such as who will hold the pencil or object being projected and guiding children to form and test hypothesis will be helpful in keeping children on task and focused throughout this experiment/challenge. Facilitation StrategiesĪssistance may be needed with covering light bulbs. Here is a link to a video which explains the experiment step by step and shows a video of what is happening. You can also find a unit on Shadows and Reflections – Boston Public Schools Focus K1 Prepare/ Background Info Also, helpful for children to have had some exposure to work with shadows such as “Growing Shadows” a lesson found on Providence Children’s Museum. Connections to previous work?Ĭonnect to work on primary and secondary colors. RI EARLY LEARNING AND DEVELOPMENT STANDARDS: MATHEMATICSĬhildren learn to identify shapes and their attributes, solve problems using shapes, and explore the positions of objects in space. RI EARLY LEARNING AND DEVELOPMENT STANDARDS: COGNITIVE DEVELOPMENTĬhildren apply strategies and draw upon past knowledge and experiences to meet goals and solve problems. RI EARLY LEARNING AND DEVELOPMENT STANDARDS: SCIENCEĬomponent 1: Scientific Inquiry and ApplicationĬhildren learn to plan for and carry out investigations and collect, evaluate, and communicate information. Teacher’s Job Align this lesson to the standards. Vary the size of the object and the distance from the screen. What two light bulbs do you think make that color? Using that information can you figure out what color combinations are making the other shadows? What information does that tell you about the way light travels? Hint: When all three light bulbs are lit, the shadow in the middle is magenta. When you have two lights (or more) uncovered, can you figure out which shadow is being cast by which light bulb? How can you test your guess? (Cover one light bulb at a time) Can you move the object close to the screen until the shadows overlap? Notice the color of the combined shadows.What color is the white board now? What color is the shadow of the pencil? How many shadows are there? Let all three light bulbs shine on the screen.Cover only one light bulb with a piece of cardboard.What color is the white board? What color is the shadow of the pencil? How many shadows are there? Hold the small cardboard in front of two of the lightbulbs. Can you change the colors of the shadow of a pencil by using different combinations of the colored light bulbs? Can you tell which light is casting which shadow? Put the object in front of the screen again and notice the colors of the shadows. Adjust the distance until you see three colored shadows on the screen. Remove the object, block one of the colored lights by placing a small piece of cardboard in front of the light bulb and notice how the color on the screen changes. Have a child hold up a pencil or a narrow object fairly close to the screen.
The light bulbs will be a little more than 3 feet from the screen.ĭarken the room as much as possible.
Set up the bulbs and the white surface, which is your screen, in such a way that the light from all three bulbs falls on the same area of the screen and all bulbs are approximately the same distance from the screen. The other piece of tape should go on the side of the box to the board. Put one piece of duct tape (about 4 inches) inside the box top and tape it to the foam board. The box should be at the bottom of the board right in the middle. Mount the foam board to the box so it will stand up. Leave a plug outlet in between the red and green and the green and blue. Then plug the bulbs into the power strip in the order of red, green and then blue. Screw the bulbs into the socket adapters. 2 pieces of small cardboard (about 4×6) or large index card.2 pieces of duct tape- about 4 inches long.Colored light bulbs-one red, one green, one blue.
3 Plug in socket adapters (available at hardware store).
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