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  4. What will be the angle of diffracting for the first minimum due to Fraunhofer diffraction with sources of light of wavelength 550 nm and slit of width 0.55 mm ?

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Q. What will be the angle of diffracting for the first minimum due to Fraunhofer diffraction with sources of light of wavelength $550\, nm$ and slit of width $0.55 \,mm$ ?

Wave Optics

Solution:

Using $d \sin \theta=n \lambda$, for $n=1$
$\sin \theta=\frac{\lambda}{d}=\frac{550 \times 10^{-9}}{0.55 \times 10^{-3}}$
$=10^{-3}=0.001\, rad$