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Angular width $(\beta)$ of central maximum of a diffraction pattern on a single slit does not depend upon
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Distance between slit and source
For single slit diffraction pattern $d \sin \theta=\lambda \quad$ ( $d=$ slit width)
Angular width $=2 \theta=2 \sin ^{-1}\left(\frac{\lambda}{d}\right)$
It is independent of $D$ i.e. distance between screen and slit
Angular width $=2 \theta=2 \sin ^{-1}\left(\frac{\lambda}{d}\right)$
It is independent of $D$ i.e. distance between screen and slit
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