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Q.

In Fraunhoffer 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 Fraunhoffer diffraction is

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a

$\frac{b^{2}}{Lλ} << 1$

b

$\frac{b^{2}}{Lλ} \neq 1$

c

$\frac{b^{2}}{Lλ} = 1$

d

$\frac{b^{2}}{Lλ} ≫> 1$

answer is C.

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Detailed Solution

Theory:

for validation of wave optics, $\frac{b^{2}}{Lλ} << 1$

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In Fraunhoffer 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 Fraunhoffer diffraction is