Question a)dsin =m Distance between 2lines in the grating,d=1/(8×10^5)

d=1.25×10^-6m , wavelength=500nm=5×10^-7m

Sin =m /d

Sin =2×5×10^-7/1.25×10^-6=0.8

Or angle=sin-1(0.8)=53.13

b)D=xtan D=2×1.333=2.666m

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