Extra: Introduce a second light source by placing two flashlights in front of the wall.Or make your own shapes! Do they all form a shadow? Why or why not? Choose different materials or different sizes. Extra: Play around with different objects.How is the size of the shadow dependent on the distance of the object from the light source? Can you explain your results? If you like, you can make a graph that shows the distance from the light source on the x axis and the size of the shadow on the y axis. Look at your results on the piece of paper.Does the shadow get smaller or bigger when you place the object closer to the light source? Again, measure and record the height of the shadow. Move the object closer to the flashlight and place it at the 40-centimeter (16-inch) mark on the measuring tape.How does the size of the shadow change when you move it farther away from the light source? Do you notice any other differences beside the size? Then measure the height of the shadow again and record its size. Once you have measured the shadow’s height, move the object closer to the wall along the measuring tape until it reaches the 10-centimeter (four-inch) mark.What do you see on the wall this time? What shape does the shadow have? If there is a shadow, take the second measuring tape and measure the shadow’s height from the table surface to its top and write its size on a piece of paper. How will the shadow change once you move the object? Place it at the 20-centimeter (eight-inch) mark of the measuring tape. Move the object directly between the wall and the flashlight so it sits on top of the measuring tape.Does the object placed on the table form a shadow? Can you explain why or why not? Switch on the light and look at the wall.What do you think you will see once you switch on the light? Then move it toward the wall until it is located 20 centimeters (eight inches) away from the wall. Take the object and place it next to the flashlight, 25 centimeters (10 inches) away. Switch the flashlight off but do not move it.What do you see on the wall once you switch on the light? How does the appearance of the wall change when you switch the light on? Switch on the flashlight and point it to the wall.Dim the lights in the room so it is dark enough to see clear shadows on the wall.It should be located 50 centimeters (20 inches) away from the wall. Put the flashlight on the table so it aligns with the measuring tape facing the wall.Select an opaque object that is able to fully block light rays from a light source.Tape the first measuring tape onto the table with the zero mark right at the wall.
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