Q. At the first minimum adjacent to the central maximum 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 mid point of the slit is :
A) $\frac{\pi}{8}$ radian
B) $\frac{\pi}{4}$ radian
C) $\frac{\pi}{2}$ radian
D) π radian
Explanation
[Solution] At the first minimum a sin θ = λ, so the path difference between edge and midpoint is λ/2, i.e. phase difference π. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.