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Diffraction is the slight bending of light as it passes around the edge of an object. The amount of bending depends on the relative size of the wavelength of light to the size of the opening. If the opening is much larger than the light's wavelength, the bending will be almost unnoticeable
When light comes through a wide whole of a opaque screen there is no diffraction.. The whole must be very tight (less than 1mm)
by The physist August 31, 2016
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