Light rays travel in straight lines. Light cannot bend around opaque objects in their way. Shadows are created when an object blocks light from the Sun or another light source. When the light can ...

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 shadow.

The everyday objects around us are white, colored or black, opaque or transparent, depending on how the electrons in their atoms or molecules respond to the driving force of electromagnetic radiation ...