![]() ![]() Objects able to block all the light are called opaque and will form a shadow. ![]() ![]() Some materials will let the light pass through whereas others will only block some of it. To cast a shadow you need an object that can block light rays. In optics, which is a special field of physics, this emitted light is modeled as a straight line called a light ray, which indicates the direction in which the light travels. All light sources emit light waves that travel away from them. This can be the sun, a lamp or a flashlight. You need some kind of light source to generate a shadow. But where do these shadows come from, and how can some of them be so huge? Do this activity and find out how to generate the largest and scariest shadow of all! Halloween is almost here, and behind every corner there seems to lurk a spooky shadow! Luckily this is all they really are-just shadows that are part of decorations set up to give you a thrill while trick-or-treating.
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