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For a single slit of width ''a'' the fir...

For a single slit of width ''a'' the first minimum of the interference pattern of a monochromatic light of wavelength e occurs at an angle of `(lambda)/(a)`. At the same angle of `(lambda)/(a)`, we get a maximum for two narrow slits separated by distance ''a''. Explain.

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Case I: The overlapping of the contributions of the wavelets from two halves of a single slit produces a minimum because corresponding wavelets from two halves have a path difference of `lambda//2`.
Case II: The overlapping of the wavefronts from the two slits produces first maximum because these wavefronts have the path difference, of `lambda` P is NAND gate and Q is OR gate.
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