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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.
Figure 10.9: Diffraction through a slit
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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.