Practice portal › Wave Optics › Diffraction
Asked in GUJCET 2016 · Single slit diffraction
Given: a diffraction pattern first in blue light and then in yellow light.
Idea: for a slit of width a the minima lie at a sin θ = nλ, so every angle in the pattern scales with the wavelength.
On a screen at distance D the central maximum is (2λ D)/a wide and the later fringes are (λ D)/a apart.
Yellow light, about 580 nm, has a longer wavelength than blue, about 450 nm, so every fringe grows by roughly a third.
The maxima and minima are broadened and become more distinct.
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