what is diffraction?
How diffraction is related to light
When a light wave collides with a particle in their path the light wave becomes altered.
Real life applications
Diffraction in real life could be as simple as the shadow of a flagpole cast by the sun. Diffraction is also used in X-rays and holograms. It is used by telescopes and has produced one of sciences most important tools; the diffraction grating.
Laser Diffraction and Interference