What makes shadows different sizes

Now move the lamp over the object. How does the shadow change? A shadow happens when an object blocks the path of light. The object must be translucent or opaque. Opaque objects make darker shadows; translucent objects make lighter shadows.

The closer an object is to the light source, the larger the shadow will be. What do you think you will see once you switch on the light? Switch on the light and look at the wall.

Does the object placed on the table form a shadow? Can you explain why or why not? Move the object directly between the wall and the flashlight so it sits on top of the measuring tape. Place it at the centimeter eight-inch mark of the measuring tape. How will the shadow change once you move the object? Switch on the light. What do you see on the wall this time?

What shape does the shadow have? How big is the shadow? Then measure the height of the shadow again and record its size. 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? Move the object closer to the flashlight and place it at the centimeter inch mark on the measuring tape.

Again, measure and record the height of the shadow. Does the shadow get smaller or bigger when you place the object closer to the light source? Look at your results on the piece of paper.

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. How is the size of the shadow dependent on the distance of the object from the light source? Can you explain your results? Extra: Play around with different objects. Choose different materials or different sizes. Or make your own shapes! Do they all form a shadow?

Why or why not? Extra: Introduce a second light source by placing two flashlights in front of the wall. How do the shadows of objects that you put in between both flashlights and the wall look?

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