In two-slit interference, if the slit separation is 17 m and the slit widths are each 2.9

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Question:

In two-slit interference, if the slit separation is 17 μm and the slit widths are each 2.9 μm, (a) how many two-slit maxima are in the central peak of the diffraction envelope and (b) how many are in either of the first side peak of the diffraction envelope?