The distance between two consecutive bright fringes (or dark fringes) in young's double slit experiment is called

Explanation

The correct answer is Option B: Fringe spacing. In Young's double slit experiment, the distance between two consecutive bright fringes or two consecutive dark fringes is known as fringe spacing. This is a result of the interference pattern created by the coherent light sources passing through the slits.Option A, Wavelength, is incorrect because it refers to the distance between successive crests of a single wave, rather than the pattern observed in an interference experiment.Option C, Half-wavelength, is incorrect as it describes half the distance of a wave cycle, not related to the spacing of fringes.Option D, Width of slit, is incorrect because it refers to the physical size of the slits in the apparatus, which influences the experiment but does not describe the distance between the fringes themselves.