How Light Casts a Shadow This phenomenon emerged from an innovative experiment led by researchers at Brookhaven National Laboratory. Using a green laser beam, a ruby crystal, and blue light ...

When the green laser interacted with the ruby, it altered the crystal’s optical properties, increasing its absorption of the blue light and casting a visible shadow in the shape of the green laser.

lasers and even blue light from smartphones. 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 ...