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1. (n.) critical angle
the minimum angle of incidence beyond which total internal reflection occurs for light traveling from a medium of higher to one of lower index of refraction.
2. critical angle
the angle of attack at which a sudden change in airflow occurs around the wings of an aircraft, reducing lift and increasing drag.
Etymology: (1870–75)
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| Definition of 'critical angle' |
Princeton's WordNet |
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1. (noun) critical angle
the smallest angle of incidence for which light is totally reflected
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