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 :

Options

A. `(b^(2))/(Llambda) gt gt1`
B. `(b^(2))/(Llambda)=1`
C. `(b^(2))/(Llambda) lt lt 1`
D. `(b^(2))/(Llambda) ne 1`

Answer

C

Explanation

The general condition for Frounhofer diffraction is
`(b^(2))/(L lambda) lt lt 1`