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quasar987

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for single-slit diffraction, the condition for MINIMUMs is:physicsilliterate said:

[tex] y \ = \ \frac{m \lambda D}{s} [/tex]

where y is the distance from central max to the m-th minimum of the diffraction pattern, m a positive integer, λ the wavelength, D the distance between single-slit and distant observation screen where diffraction pattern will be observed, and s the single-slit width. Thus:

a) increasing single-slit width will decrease width of central max ("shrink the diffraction pattern");

b) increasing wavelength will increase width of central max ("expand the diffraction pattern")

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