noun
: the ratio of the angle subtended at the eye by the image formed by an optical instrument to that subtended at the eye by the object when not viewed through the instrument
noun
: the ratio of the angle subtended at the eye by the image formed by an optical instrument to that subtended at the eye by the object when not viewed through the instrument
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012