Monochromatic light of wavelength 6000Å  was used to set up interference fringes. On
Channel: Doubtnut
Date: 2020-05-09

Monochromatic light of wavelength 6000Å  was used to set up interference fringes. On the pasth of the interhering waves a mica sheet `12xx10^(-5)` cm thick was placed when the central bright fringe was found to be displaced by a distance equal to the width of a bright fringe. what is the refractive index of mica?