Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 98
side of thefocus, where they have crossed each other and arediverging, and are rendered parallel hy a convex lens. We may now sum up the use of the eye-lens. Theimage is brought to a focus on the retina, because theobject is some distance off, and the rays from every point,(as from a and b, Fig.… … Fig, 38.—Telescope, a, object-glass, giving an image at b ; c, lens for magnify-ing image B. (as in the lower figure), it is impossible to do it unlesssome optical aid is obtained, for the rays are too divergent,and cannot be brought to a focus on the retina. Whatdoes that optical aid effect ? It…
Astronomy · Telescopes
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