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absolute alcohol
absolute altimeter
absolute blocking
absolute ceiling
Absolute constant
absolute convergence
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Absolute refractive index definitions

Webster's 1913 Dictionary

Refractive Re*fract"ive (r?*fr?kt"?v), a. [Cf. F. r['e]fractif. See Refract.] Serving or having power to refract, or turn from a direct course; pertaining to refraction; as, refractive surfaces; refractive powers. Refractive index. (Opt.) See Index of refraction, under Index. Absolute refractive index (Opt.), the index of refraction of a substances when the ray passes into it from a vacuum. Relative refractive index (of two media) (Opt.), the ratio of the sine of the angle of incidence to the sine of the angle of refraction for a ray passing out of one of the media into the other.


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