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A parallel beam of light of wavelength λ is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the second minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of slit is
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- πλ
- 2π
- 3π
- 4π
Correct Option: D
Conditions for diffraction minima are Path diff. Δx = nλ and Phase diff. δλ = 2nπ
Path diff. = nλ = 2λ
Phase diff. = 2nπ = 4π (∵ n =2)
