What is the maximum condition for light diffraction?

The condition of the main maxima: d sin a = kl, where l = 0, ± 1, ± 2 … The distance between adjacent holes in the lattice (sources) is d, and the path difference between them is D = d sin a. If this segment contains an integer number of wavelengths, then the waves from all the slots, adding up, will amplify each other. The maximum will be observed.

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