Question

Two coherent light sources `S_1` and `S_2 (lambda=6000Å)` are `1mm` apart from each other. The screen is placed at a distance of `25cm` from the sources. The width of the fringes on the screen should be
A. `0.0015 cm`
B. `0.025` cm
C. `0.010` cm
D. `0.030cm`

Answer 1

Correct Answer - A
`beta =(D)/(d) lambda=(25xx600xx10^(8))/(10^(-1)) =0.015 cm`