Refractive index measurement of high refractive index glass beads.
The refractive index of a small sphere and rod was measured by a method using the theory of rainbow that the minimum deviation angle of a single internally reflected ray from a sphere depends solely on the relative refractive index of the sample to the medium. Experimental results confirmed an accuracy of about 1%. This method is particularly suited to materials of high refractive index, because the conventional immersion method needs liquid of higher refractive index, which inevitably contains such poisonous elements as As.
Yamaguchi
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