Up: Properties of light
Another property that light exhibits is that it diffracts, which
loosely speaking means it bends around the corner when it passes through
an opening. This is illustrated below.
Diffraction through a slit
For reasons that we will see later, we don't normally encounter
diffraction of light in our everyday lives. However, we can readily
demonstrate the diffraction of sound: if one speaks through an open door,
someone standing directly around the corner of the doorway
(indicated by a star in the figure) can readily hear the
sounds. One says that the sound has diffracted around the doorway.