Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 128
which increases very rapidly CHAP. VIII.] THE EEFLECTOE 105 as the diameter of the mirror increases or as the focallength diminishes. For instance, d i, Fig. 58, is thesegment of a circle, or the section of a sphere—if we dealwith a solid figure. D c, e g and h i, are three linesrepresenting… … Fig. 58.—DiaOTam Illustiatiug STjlierical Aberration. the angle F G L, equal to the angle of incidence E g L ;then F will be the focus, so far as this part of the mirroris concerned. Now let us repeat the process for the rayH I, and Ave shall find that it will be reflected to k, apoint nearer the…
Astronomy · Telescopes
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