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In Fraunhoffer diffraction experiment , L is the distance between screen and the obstacle, b is the size of the obstacle and $\lambda$ is wavelength of incident light. The general condition for the applicability of Frauhoffer diffraction is

\[\begin {array} {1 1} (1)\;\frac{b^2}{L \lambda} > > 1 & \quad (2)\;\frac{b^2}{L \lambda} = 1 \\ (3)\;\frac{b^2}{L \lambda} < < 1 & \quad (4)\;\frac{b^2}{L \lambda} \neq 1 \end {array}\]
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$ (3)\;\frac{b^2}{L \lambda} &lt; &lt; 1 $
answered Nov 7, 2013 by pady_1

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