Determination of complex refractive index using maximum deviation angle through prism

Light-absorbing materials are widely used, and their optical properties an important factor. Snell's law does not hold in that partially absorb light. Hence, the path refraction is calculated from Maxwell's law. We used to obtain deviation angle when a light passes through prism made of light-absorbing material. The has local maximum. near maximum sensitive real imaginary parts refractive index. its incident determine complex index refraction. This measurement same advantages as measuring minimum transparent prism. detection easy. Then, it necessary measured angle. These two angles plotted parametrically by varying part under fixed part. similar curves drawn parts. Each curve value for or Drawings these many prior measurement. Then we select four closest Four values attached each method this paper can easily be material identification.