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  4. In Fraunhofer diffraction experiment, L is the distance between screen and the obstacle, b is the size of obstacle and λ is wavelength of incident light. The general condition for the applicability of Fraunhofer diffraction is

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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

NTA AbhyasNTA Abhyas 2020Wave Optics

Solution:

The general condition for Fraunhofer diffraction is $\frac{b^{2}}{L \lambda }$ $≪ 1$ .