British Universities Film & Video Council

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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

Credits

Director
Eric Lucey
Contributor
Eric Lucey; Roy Gill; Terry Scoffin

Distribution Formats

Type
Film
Format
16mm

Sponsor

Name

University of Edinburgh, Department of Geology

Distributor

Name

Higher Education Film & Video Library

Email
services@bufvc.ac.uk
Web
http://bufvc.ac. External site opens in new window
Phone
020 7393 1503
Fax
020 7393 1555
Address
c/o British Universities Film & Video Council
77 Wells Street
London
W1T 3QJ
Notes
Catalogue available from British Universities Film & Video Council.
Name

University of Edinburgh, Department of Animal Genetics, Research Film & Educational Technology Unit

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