... with an object or person.
This makes a shadow.
Change its direction by making it pass into another transparent material of different density, like glass or water. This is called REFRACTION, and it's how lenses work. There are actually other ways to bend or deflect light, including diffraction gratings and holographic lenses. Scientists have also found that gravity can bend light!
View "Bending Light" demo from the University of Colorado Boulder
Put your cursor over a picture to see what it is