Errors in critical-angle measurement of refractive index of optically absorbing materials

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, , Citation G H Meeten et al 1984 J. Phys. E: Sci. Instrum. 17 642 DOI 10.1088/0022-3735/17/8/004

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1 Dept. of Phys., City of London Polytech., London, UK

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0022-3735/17/8/642

Abstract

Large errors are possible in critical-angle measurements of the refractive index of optical absorbers. These arise from the dependence of the reflectivity and transmissivity of a plane optical interface on the imaginary part of the complex relative refractive index. The errors are calculated directly from the Fresnel equations.

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