Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 376
opes, as theprincipal focus is outside the lenses. The Huygens eyepiece has two plano-convexlenses (Fig. 437), the one next the eye having afocal length ^ that of the other, and tlie distance between beingtwice the focal length of the shorter. This eyepiece is ordinarilyfound in microscopes, and it… … the object passes through theobjective 0, and would, ifallowed to do so, form a realimage ^^Qy But a concavelens E, placed in its way,diverges the rays so that onentering the eye they seemto come from pq. This imageis erect and virtual. This instrument is alsoknown as Galileos telescope.It was…
Physics
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