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apply dsintheta = (m+0.5)L
for highest order theta = 90 deg
so m +0.5= d/L
m = 1500nm/690 nm
m = 2.17-0.5 = 2
highest order = 2
sin(theta) = m*lambda/a
sin(theta) = 1 (max)
m=1*a/lambda = 1500/690 = 2.17
m = 2 (2nd order dark fringe)
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