Practice portal › Wave Optics › Diffraction
Asked in RS Academy GUJCET booklet · Single slit diffraction
Given: a diffraction pattern first in red light and then in blue light.
Idea: for a slit of width a the minima lie at a sin θ = nλ, so every width in the pattern is proportional to the wavelength.
On a screen at distance D the fringe width is (λ D)/a.
Blue light, about 450 nm, is shorter than red, about 700 nm, so each fringe shrinks to roughly two-thirds of its former width.
The maxima and minima become narrow and more crowded.
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