Q. In Fraunhofer diffraction experiment, L is the distance between screen and the obstacle, b is the size of obstacle and $\lambda$ is wavelength of incident light. The general condition for the applicability of Fraunhofer diffraction is
A) $\frac{b^{2}}{L\lambda} > > 1$
B) $\frac{b^{2}}{L\lambda} = 1$
C) $\frac{b^{2}}{L\lambda} < \ < 1$
D) $\frac{b^{2}}{L\lambda} \neq 1\ $
Explanation
(c) The general condition for Frounhofer diffraction is $\frac{b^{2}}{L\lambda} \ll 1.$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.