At the first minimum adjacent to central maximum of a single-slit diffraction pattern, the phase difference between Huygens wavelet from edge of slit and wavelet from midpoint of slit is:
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Question

At the first minimum adjacent to central maximum of a single-slit diffraction pattern, the phase difference between Huygens wavelet from edge of slit and wavelet from midpoint of slit is:

G1 Physics · Accepted Answer

Step 1: First minimum: total path difference across slit Δ = a sin θ = λ. Step 2: Edge to midpoint path difference is Δ/2 = λ/2. Step 3: Phase difference Δφ = (2π/λ)(λ/2) = π radians. Final answer: (C) π radian.