Question

ratio of width of principal maxima o second order maxima in fraunhofer single slit diffraction is?

Answer 1

In traditional classical physics diffraction arises because of the way in which waves propagate; this is described by the Huygens–Fresnel principle and the principle of superposition of waves. ... Hence, diffraction patterns usually have a series of maxima and minima.

Answer 2

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correct answer is 2 becoz it's the third ring after principal Maxima.