26.69.Set Up:The bright fringes are located by First-order means The line density is The largest appears at the largest If the line is at then the line is to be at Solve:so so This givesand The line density is Reflect:and the second order pattern doesn’t include all of the visible spectrum. The first order is the only order that displays the entire visible spectrum.26.70.Set Up:For destructive interference the net phase difference must be which is one-half a period, orIn phase,Ais or ahead of B. At points above the centerline, points are closer to Athan to Band thesignal from Agains phase relative to Bbecause of the path difference. Destructive interference will occur when1,At points at an angle below the centerline, the signal from Bgains phaserelative to Abecause of the phase difference. Destructive interference will occur when 1,Solve:Points above the centerline:Points below the centerline:26.71.
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