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- When light passes through an opening with
- length on the order of the wavelength of the light,
- the light appears to spread out when it emerges
- from the other side. This spreading is known as
- diffraction.
- Since the aperture is being compared to the
- wavelength of the light, it is useful to consider
- light of one wavelength, or monochromatic
- light. If, in addition, the situation is limited to
- coherent light, or light that maintains its phase
- difference, the different areas of interference can
- be studied. After diffraction, where the waves
- constructively interfere, the light appears
- more intense. Where the waves destructively
- interfere, the light is less intense.
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