Two numbers, e.g. 10 × 50 or 11 × 80, designate a binocular. The first of these numbers is the magnification; the second is the diameter of the objective lenses in millimetres. For example, a 7 × 50 binocular has a magnification of ×7 and objective lenses of diameter 50 mm.
KeywordsRoot Mean Square Charge Couple Device Light Cone Rayleigh Criterion Exit Pupil
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