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A study on the brilliance by critical angle of gem and measurement theory of refractive index using refractometer

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2011, 21(3), pp.105-109
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

문소이 1 SEOK, JEONG-WON 1

1동신대학교

Accredited

ABSTRACT

Critical angle of quartz (R.I.≒1.553) and diamond (R.I. = 2.417) are 40.09oand 24.26othat calculated by sinθ = r2/r1 (r = refractive index, r1 > r2). Brilliance of quartz and diamond are 20.33 % and 55.07 %. The brilliance data are result of study on the incident light internal round brilliant cut quartz and diamond by the critical angle. Cause of bow-tie phenomenon can be studied by application of critical angle theory and light path inside fancy shape brilliant cut. When refractormetry with typical gem refractometer, critical angle of quartz and corundum are 59.1oand 77.9o.

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