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

Options

A. 0.001 rad
B. 0.01 rad
C. 1 rad
D. 0.1 rad

Answer

A

Explanation

Using `d sin theta = n lamda`, for `n =1`
`sin theta = (lamda)/(d) =(550 xx10^(-9))/(0.55 xx10^(-3))=10^(-3)=0.001 rad`.