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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

Options

  1. Ab 2 L λ ≫ 1
  2. Bb 2 L λ = 1
  3. Cb 2 L λ ≪ 1
  4. Db 2 L λ ≠ 1

Correct answer

C. b 2 L λ ≪ 1

Step-by-step solution

The general condition for Fraunhofer diffraction is b 2 L λ ≪ 1 .

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