Interference: Diffraction Grating

With 5 slits, get cancellation when ?s = 0.8?; with two slits, only get complete cancellation when ?s = 0.5? .

d

lens

bright

bright

s1

s2

s3

s4

s5

s2 = s1 + .8?

s3 = s2 + .8? = s1 + 1.6?

s4 = s3 + .8? = s1 + 2.4?

s5 = s4 + .8? = s1 + 3.2?

dark

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