Question: An interference pattern is produced by four parallel and equally spaced, narrow slits. By drawing appropriate phasor diagrams, show that there is an interference minimum

An interference pattern is produced by four parallel and equally spaced, narrow slits. By drawing appropriate phasor diagrams, show that there is an interference minimum when the phase difference Φ from adjacent slits is
(a) π/2;
(b) π;
(c) 3π/2 in each case, for which pairs of slits is there totally destructive interference?

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