When a mica plate of thickness `0.1` mm is introduced in one of the interfering beams,
Channel: Doubtnut
Date: 2020-02-16

When a mica plate of thickness `0.1` mm is introduced in one of the interfering beams, the central fringe is displaced by a distance equal to 10 fringes. If the wavelength of the light is `6000 �` , the refractive index of the mica is