Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 133
t angles of incidence on the second and becomerecomLined. Let us take tlie case of a well-known eyepiece, calledthe Huyghenian eyepiece, after its inventor. It con-sists of two plano-convex lenses, a and b Fig. 60, withtheir convexities turned towards the object-glass, andhaving their focal lengths… … Fig. 60.—Huygheii.s Eyepiece. a focus at f, half way between the lenses, and nearer tothe object-glass than it would have been without thelens. This image is then viewed l)y the eye-lens, A, anda magnified image of it seen apparently at f, as hasbeen before explained. Now let us see how the…
Astronomy · Telescopes
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