Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 121
tinue H 98 STARGAZING : IAST AND PllESENT. [liOOK II. the lines G A nnd h b backwards, they will meet at M,and therefore the rays diverge frorn the mirror as ifthey came from a point at M, and this point is calledthe virtual focus. So much for parallel rays. Next let us consideranother case which… … Fig. 53.—Reflcctiuu at Kava bv Convex Mirror. will be made parallel, at b k and A f, after reflection, andit is manifest that by making the mirror sufficiently con-vex, these rays, tending to come to a focus at M, couldbe rendered divergent; and if the curvature is decreasedby making the centre of…
Astronomy · Telescopes
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