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Conditions for diffraction minima are Path diff. Δx = nλ and Phase diff. δΦ = 2nπ. Path diff. = nλ = 2λ, Phase diff. = 2π = 4π (∴ n = 2).

1. δΦ = 1.22 λ/D
2. δΦ = 2.44 λ/D
3. δΦ = 0.61 λ/D
4. δΦ = 3.66 λ/D

Correct answer: δΦ = 2.44 λ/D

Solution

The condition for diffraction minima is given by the phase difference δΦ = 2.44 λ/D for the second-order minimum (n = 2). This matches the given conditions.

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