Question

two coherent sources separated by distance d are radiating in phase having having wavelength lemda . A detector moves in a big circle around the two sources in the plane of two sources .the angular position of n=4 interference is given by

Answer 1

Answer:

Here path difference at a point P on the circle is given by

Explanation:

Δx=dcosθ  …(i)

For maxima at P

Δx=nλ …(ii)

From equations (i) and (ii)

nΛ=dcosθ⇒θcos−1(nλd)=cos−1(4λd)