This Calculator Will Help You To Calculate phase retardation of light at non-normal incidence of birefringent crystal when the optical axis is parallel to the crystal surface and perpendicular to the plane of incidence
The ordinary Refraction Refractive Index n$_o$; The extra-ordinary refraction refractive index n$_e$; Wavelength $\lambda$; Thickness of The Crystal d;Phase retardation $\delta$;