NCERT · Class 12 · Physics · Wave OpticsDefine fringe width in Young's double slit experiment.

Fringe width in Young's double slit experiment is defined as the separation distance between two consecutive bright fringes or two consecutive dark fringes on the observation screen. It is denoted by beta and is given by the formula beta = lambda * D / d, where lambda is the wavelength of monochromatic light used, D is the distance between the slits and the screen, and d is the distance between the two coherent slits.