Why single slit diffraction envelopes double slit interference?
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The slit separation and the distance between the wall and the slits did have an effect on the interference pattern. ... As the number of slits increased, the fringe width would also increase, because with more slits, the more slits the light waves could travel through, and more interference could occur.
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The amplitude should be proportional to the width. In single slit diffraction calculations, the resultant amplitude is obtained by dividing the slit width into a large number of equal segments.
The intensity is proportional to the square of slit width, as intensity is proportional to the square of the amplitude.
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