The bending or spreading of light through an opening or around an obstacle.
Goethe "flexibility of light"
Why is it possible to hear around corners, but not see around them?
|Diffraction of laser light through a vertical opening of decreasing width. Note that as the opening gets narrower, the amount of diffraction in the horizontal direction increases. (The interference fringes will be dealt with in a later section of this book.) This image sequence is also available as an animated gif.|
Double source interference. Laser light through two closely spaced slits.