Diffraction & Interference (Light)


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


[need pic]
Double source interference. Laser light through two closely spaced slits.