At the first minima, adjacent to the central maxima of a single - slit diffraction pattern, the phase difference between the Huygen's wavelet from the edge of the slit and the wavelet from the midpoint of the slit is
A
π8 radian
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B
π4 radian
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C
π2 radian
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D
π radian
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Solution
The correct option is Dπ radian ForfirstminimaatP,asinθ=λSo,phasedifferenceΔϕ1=Δx1λ×2π=(a/2)sinθλ×2πΔϕ1=λ2λ×2π=πradian