critical angle

symbol: θc
https://doi.org/10.1351/goldbook.08584
Smallest angle of incidence at which total internal reflection occurs.
Note:
If n2 and n1 are the refractive indices, and n2>n1, at the boundary, sin⁡θc=n1/n2.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 742 [Terms] [Paper]
Citation: 'critical angle' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08584 RIS BibTex EndNote
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