Question

What is fringe width?

Answer 1

1. The fringe width is the distance between two successive bright or dark fringes.
2. The distance between two fringes can be calculated by
   $\mathrm{\beta }=\frac{\mathrm{\lambda D}}{\mathrm{d}}$
   where,$\mathrm{\beta }$ represents fringe width, $\mathrm{\lambda }$ represents wavelength, $\mathrm{D}$ represents distance between slit and screen, and $\mathrm{d}$represents the distance between two slits.
3. Fringe is the alternating light and dark band that forms as a result of interference.