We have shown that the secondary maxima in a single-slit diffraction pattern do not fall e...

We have shown that the secondary maxima in a single-slit diffraction pattern do not fall exactly halfway between minima, but are quite close. Assuming they are halfway:

a. Show that the irradiance of the mth secondary peak is given approximately by

 

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b. Calculate the percent error involved in this approximation for the first three secondary maxima.