In the Fraunhofer diffraction experiment,$L$ is the distance between the screen and the obstacle,$b$ is the size of the obstacle,and $\lambda$ is the wavelength of the incident light. The general condition for the applicability of Fraunhofer diffraction is:
- A$\frac{b^2}{L \lambda} \gg 1$
- B$\frac{b^2}{L \lambda} = 1$
- C$\frac{b^2}{L \lambda} \ll 1$
- D$\frac{b^2}{L \lambda} \neq 1$
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