A parallel beam of sodium light of wavelength `6000 Å` is incident on a thin glass plate of `mu=1.5
Channel: Doubtnut
Date: 2020-08-23

A parallel beam of sodium light of wavelength `6000 Å` is incident on a thin glass plate of `mu=1.5`, such that the angle of refraction in the plate is `60^(@)`. The smallest thickness of the plate which will make it appear dark by reflected light is