The condition for diffraction of mth order minima is

Options

A. `d sin theta_(m)=m lambda, m=1,2,3, …`
B. `d sin theta_(m)=(m lambda)/(2), m=1,2, 3, …`
C. `d sin theta_(m)=(m+1)(lambda)/(2), m=1,2,3,…`
D. `d sin theta_(m)=(m-1)(lambda)/(2), m=1, 2, 3,…`

Answer

A

Explanation

For obtaining mth secondary minima at a point on screen, path difference between the diffracted waves
`Delta=d sin theta_(m)= pm mlambda` where, m = 1, 2, 3, …..