Diameter 1 (dia, X, or x)


Diameter 1 (dia, X, or x) :

A unit of magnification equivalent to power. "Power" tends to be used in adjective phrases, such as "120-power eyepiece" or "7-power binoculars." "Diameters" often appear in declarative statements of magnification, such as, "the eyepiece lens magnifies 120 diameters."

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