A beam cannot have a thinner diameter than its wavelength since 1: it CAN have a thinner diameter
2: Huygens principle will no longer apply
3: it depends on the wavelength
4: the wavelets are unable to interfere destructively outside the beam
5: the wavelets cannot interfere constructively in front of the beam
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Diffraction occurs
1: for light waves only
2: only in three dimensions
3: only for thin enough objects
4: only at certain speeds
5: for objects larger than the
wavelength of the wave
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