The linear variation of this quantity with applied
The linear variation of this quantity with applied electric field is known as the Pockels effect and evanescence occurs when the magnitude of this physical quantity is dominated by the extinction coefficient. The path integral of this quantity is classically stationary according to Fermat's principle; a fact which may be used to derive the law of Snellius, which governs this property's namesake phenomenon at the interface of two media with different values for it. FTP, identify this physical property that is commonly defined as the ratio of the speed light in a medium to that in a vacuum.
The linear variation of this quantity with applied electric field is known as the Pockels effect and evanescence occurs when the magnitude of this physical quantity is dominated by the extinction coefficient.
index of refraction (prompt on n or eta)