Becke Line, The

Synopsis: The opening sequences illustrate, with the aid of an optical bench, the general theory of the formation of the Becke line. The theory is then applied to microscope studies using both grain mounts and thin sections of rocks. Positive and negative, high, medium and low relief, are defined and their significance in relation to the refractive index of a mineral discussed. The polarising microscope method of determining refractive index of a mineral, relative to a single mounting medium, Canada balsam, and to a range of mounting media is demonstrated. Finally, reference is made to the complications arising in the determination of the refractive indices of anisotropic minerals.
Language: English
Country: Great Britain
Medium: Film; Film. 16mm. sd. b&w. 16 min.
Technical information: Black-and-white / Sound
Year of production: 1974
Availability: Sale (Univ Edinburgh)
Uses: First-year undergraduate students of geology.
Subjects: Geology
Keywords: Becke line; minerals

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