Question: Derive this expression for the intensity pattern for a three-slit grating: I = 1/9 Im (1 + 4 cos + 4 cos2 ), where

Derive this expression for the intensity pattern for a three-slit "grating": I = 1/9 Im (1 + 4 cos Φ + 4 cos2 Φ), where Φ = (2πd sin θ) / λ and a << λ.

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