angle of minimum deviation — An Etymological Dictionary of Astronomy and Astrophysics

angle of minimum deviation

زاویه‌ی ِ کژرفت ِ کمینه

zâviye-ye kažraft kaminé

Fr.: angle de déviation minimale

The angle between the light entering and exiting the prism when the light passing through the prism is parallel to the prism’s base. Angle of minimum deviation (D) is used to measure the → index of refraction (n) of the prism glass, because:

n = sin [(A + D)/2]/sin (A/2), where A is the → prism angle.

See also: → angle; → minimum; → deviation.

An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک