Question

(vi) A diffraction pattern is obtained by making blue light
incident on a narrow slit. If blue light is replaced by red
light, then the diffraction bands
(a) disappear
(6) become broader
(c) become narrower (d) remain same​

Answer 1

Answer:

The width of the fringe in diffraction pattern is given as \dfrac{D\lambda}{d}

d

Dλ

Hence when the red light is replaced by blue light, the wavelength decreases which means that the fringe width decreases and pattern becomes narrower and crowded together.