A crystalline plate cut parallel to its optical axis is `0.25mm` thick and serves as a quarter-wave
Channel: Doubtnut
Date: 16/08/2020

A crystalline plate cut parallel to its optical axis is `0.25mm` thick and serves as a quarter-wave plate for a wavelength`lambda = 530nm`. At what other wavelength of visible spectrum will it also serve as a quarter-wave plate? The difference of refractive indices for extraordinary and ordianry rays is assumed to the constant and equal to `n_(e) - n_(0) = 0.0090` at all wavelength of the visible spectrum.