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  4. The width of the diffraction band varies

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Q. The width of the diffraction band varies

KCETKCET 2006

Solution:

Width of the diffraction band is given by
$\beta=\frac{\lambda D}{d}$
where $D=$ distance between slit and the screen
$\lambda=$ wavelength of light used and
$d=$ width of slit.
Hence, width of the diffraction band varies directly as the distance between the slit and the screen.