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A study of the extension of the rod and cone photorefractometer principle to the measurement of N and K, the real and imaginary parts of refractive index of absorbing fluids, is made. Theoretical analysis indicates high sensitivity in the low-absorption-coefficient region of the specimen when the illumination is incident at the interface at an angle close to the critical angle. Experiments are made on various rod configurations and results agree closely with theory.
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Kapany et al. (1963) studied this question.
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