This document specifies the measurement method used for calculating the temperature coefficient of the refractive index by measuring the refractive index, which changes with the temperature of the optical glass using the minimum deviation method.

The intended temperature range for the specified measurement method is –40°C to +80°C.

The intended wavelength range for the specified measurement method is 365nm to 1014nm.

The intended accuracy for the specified measurement method is 1×10^-6 K^-1.

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