Question

Distance between interference fringes. Width of an interference fringe.

Answer 1

Solution

These both things are related to young's double slit experiment, in which If any monochromatic light source with wavelength $\lambda$

Falling on two slits (which are seperated by by distance d) then interference of waves happened then an interference pattern is seen on Screen which is D distance from slits.

Then width of interference fringes is given by as

$\beta=\frac{\lambda D}{d}$

Where D is distance slits to interference fringes on screen.