Light of wavelength 633 nm is incidenton a pair of identical stits of width0.15 mm and center-to-centerseparation of 1.5 mm. The diffractionpattern is observed on a screen atdistance 4 m. Calculate the spacingbetween consecutive zeros of intensity(in mm to 2 d.p.); and calculate howmany peaks in total (on both sides)have intensity above 20 percent of theon-axis peak. (Hint: notesinc 2.0 = 0.454)The spacing of zeros is1.69mm, and the total number of peaks withat least 20 percent of central intensity is

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