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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

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

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Solution:

The general condition for Fraunhofer diffraction is .

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