Fig. 58. 88 Elements of Physics. the points of a pair of scissors depends upon the angleformed by the handles, and in like manner the size of theimage formed on the retina of the eye depends upon thevisual angle. Since the visual angle diminishes as the dis-tance from the eye increases, the… … Fig. 59. also diminishes (Fig. 59), at twice the distance the angleor apparent size is one-half as great; at three timesthe distance it is one-third as great; and so on. Whenthis angle is less than one three-hundredth of a degree,the object forming it becomes invisible to the unaidedeye. Reflection…
Physics
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