Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 173
see thatthe magnifying-power of a simple microscope is greater asits focal length is less. 164. The Compound Microscope,—For viewing objectsunder any but the lowest magnifying-powers, that is, in all 160 PHYSICS. cases wher^ the apparent diameter of the image is to beanywhere from 50 to 5000 times… … single, but generally consisting of two convex lenses, andan objective, 11, frequently consisting of from two to sixpieces. These lenses are fixed in a brass tube so arrangedthat the distance between the eye-piece and the objectivecan be varied at will, within certain limits. A mirror, nothere…
Physics
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