Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 193
however, a wave motionof very short wave-length, and a slight bending of the wavesoccurs at the edges of an obstacle. When the nature of theimage of a luminous point produced by a circular aperture isinvestigated by the accurate physical method, it is found toconsist of a central disc, brightest in… … e o o -f Fig. 54.—To illustrate Resolving Power. smallest radius is seen. The diameter of the dark ring betweenthe central nucleus and the first bright ring is 1-22 XF/a, Xbeing the mean wave-length of the hght, a the aperture ofthe object-glass and F its focal length. The larger the aperturefor a…
Astronomy
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