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(B) The width of the diffraction bands (or the distance between successive minima/maxima) is given by the formula $\beta = \frac{\lambda D}{a}$.From t

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diffraction bands become narrow and crowded together.

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(B) The width of the diffraction bands (or the distance between successive minima/maxima) is given by the formula $\beta = \frac{\lambda D}{a}$.From this relation,we can see that the band width $\beta$ is directly proportional to the wavelength $\lambda$ of the light used,i.e.,$\beta \propto \lambda$.We know that the wavelength of blue light is smaller than the wavelength of red light,i.e.,$\lambda_{	ext{blue}} Since $\lambda$ decreases,the band width $\beta$ also decreases.Therefore,the diffraction bands become narrow and crowded together.

$A$ diffraction pattern is obtained using a beam of red light. If red light is replaced by blue light,then:

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