Answer to Question #223919 in Optics for Anurag

Question

What will be the angle at which the first dark band is formed in Fraunhofer diffraction patte de 0.3 mm wide and wavelength of source is 5890A

Answer 1

$\sin\theta\approx \theta=\frac{\lambda}d,$

$\theta=0.0197~(rad)=1.12°.$