Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 219
ND MICROSCOPE. 209 than the princi-pal focus, F, sothat the eye seesan erect virtualimage of the ob-ject at AB. Thisis much enlarged.Its position isfound by tracing the rays which enter the eye back until theymeet the axis drawn through the point where they arise.Reading glasses are simple…
Physics
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