Therefore, the relationship between diffraction and interference is unilateral. Diffraction from two or more sources produce interference but interference cannot produce diffraction. This is because sound waves produced by the speaker bend around small obstacles such as the building walls.ĭiffraction and interference are related concepts as interference is produced when diffraction from two or more openings does occur. The same phenomenon occurs when a wave encounters a small obstacle as well.ĭiffraction of sound waves enables us to hear even when the speaker is round a corner of a building. If the aperture enlarges, waves straighten because they experience diffraction only at the edges of aperture.
When the aperture is much larger than the wavelength, no diffraction occurs and when the aperture is smaller than wavelength, circular wavefronts are produced. The condition to obtain diffraction is that the dimensions of aperture or of the obstacle must be comparable to wavelength. What does Huygens Principle say on diffraction of waves?īy definition, diffraction is the process by which a wave is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the waveforms produced.What is the relationship between diffraction and interference?.What happens to the shape of waves in diffraction?.What are the conditions for diffraction to occur?.In these revision notes for Diffraction of Waves, we cover the following key points:
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