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Q.
The width of the diffraction band varies
CMC MedicalCMC Medical 2009
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.