Single slit diffraction4/1/2023 ![]() When the gap size is smaller than the wavelength (top movie), more diffraction occurs and the waves spread out greatly – the wavefronts are almost semicircular. When the gap width is larger than the wavelength (bottom movie), the wave passes through the gap and does not spread out much on the other side. slit is narrower than the wavelength Gap width = two wavelengths i.e. When the size of the gap changes, how does this change the diffraction of the wave? When does maximum diffraction occur? (Think about your previous findings on the diffraction of sound around an obstacle). The difference between the movies is the size of the gap. This is shown in the two animations below. In the pattern formed on a screen 1.15 m away, the first dark band is 7.50 mm from the center of the central bright band.Diffraction also occurs when a wave passes through a gap (or slit) in a barrier.
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