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Ch. 7: Optical Properties

Ch. 7: Optical Properties Page of 187 Ch. 7: Optical Properties Text size:minus plus Restore normal size   Mail page  Print this page
critical angle and more light will be totally reflected within the substance. For diamond n -- 2.42 and i = 24° 26';
for water n = 1.33 and i = 48° 36'. The low value of
critical angle in diamond causes total reflection more easily and because of repeated total reflection in cut stones, the brilliancy is very much enhanced. The reverse is the
case in quartz. -Repeated total reflection in cut stones with high dispersion tends to improve the fire.
Determination of refractive index
The determination of refractive index is one of the most accurate and easily applied tests to determine precious stones. There are three methods: (1) Approximate im­mersion method, (2) Becke's method, and (3) Refractometer method.
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Ch. 7: Optical Properties Page of 187 Ch. 7: Optical Properties
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