Colors of Light
Reflection and Refraction
Energy and Matter
Science Main Index
Light can bounce off objects and even bend going through materials. Check out this page on reflection and refraction to see how this works.
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If you hold your hand underneath a light, you will see a shadow of your
hand. This is because your hand is opaque. It does not let the light shine
through it. Therefore, the area behind your hand is dark, forming a shadow.