WASHINGTON - Can light itself cast a shadow? It may sound like a philosophical riddle, but researchers have found that under certain conditions, a laser beam can act like an opaque object and cast a ...
A shadow is a dark shape made when light is stopped or blocked by an object or a person. Some objects are opaque such as stone, metal and wood. This means light doesn't travel through them.
The closer to the light source an object is, the bigger the shadow will be. This is because the object blocks more of the light. The further away from the light source an object is, the smaller ...