Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 457
will be 10i2. Magnifications as high as 2500 or .6 X .6 3000 are sometimes used, but it is impossible to go much farther, for thereason that the image becomes too faint to be seen when it is spreadover so large an area. 459. The opera glass. On account of the large number of lenseswhich must be… … The opera glass the telescope, and an eyepiece Avhich is a concave lens of the same focallength as the eye of the observer. The effect of the eyepiece is there-fore to just neutralize the lens of the eye. Hence the objective, in effect,forms its image directly upon the retina. It will be seen that…
Physics
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