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Answer for the clue "What reviewer usually offers maybe beyond which reflection less than total ", 14 letters:
critical angle

Word definitions for critical angle in dictionaries

Wikipedia Word definitions in Wikipedia
Critical angle can refer to: Critical angle (optics) ; the angle of incidence above which Total Internal Reflection occurs Critical angle of attack , in aerodynamics; the angle of attack which produces the maximum lift coefficient Critical angle of repose ...

Wiktionary Word definitions in Wiktionary
n. 1 (context physics English) The smallest angle of incidence for which light is totally reflected from a boundary between one medium and a less refractive one 2 (context aerodynamics English) The smallest angle of attack of an airfoil at which lift suddenly ...

WordNet Word definitions in WordNet
n. the smallest angle of incidence for which light is totally reflected

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Critical \Crit"ic*al\ (kr[i^]t"[i^]*kal), a. [See Critic , n., Crisis .] Qualified to criticise, or pass judgment upon, literary or artistic productions. It is submitted to the judgment of more critical ears to direct and determine what is graceful and ...

Usage examples of critical angle.

He had it all visualized, every critical angle was vivid as hell in his mind's eye.

But light coming from the sides was partially reflected and above there was a critical angle where total reflection occurred.