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(A) The width of the diffraction bands is given by the formula $\beta = \frac{D\lambda}{d}$,where $D$ is the distance of the screen from the slit,$\la

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Bands will become narrower and crowd together

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(A) The width of the diffraction bands is given by the formula $\beta = \frac{D\lambda}{d}$,where $D$ is the distance of the screen from the slit,$\lambda$ is the wavelength of light,and $d$ is the slit width.From this relation,it is clear that the band width is directly proportional to the wavelength,i.e.,$\beta \propto \lambda$.Since the wavelength of blue light $(\lambda_{	ext{blue}})$ is smaller than the wavelength of red light $(\lambda_{	ext{red}})$,the diffraction bands produced by blue light will be narrower and more crowded together compared to those produced by red light.

$A$ diffraction pattern is obtained by using a beam of red light. What will happen if the red light is replaced by blue light?

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