inted page. Hold the eye about two centimeters from the upper sur-face of the magnifier, then alternately raise and lower the magnifieruntil a clear image may be seen. (This mutual arrangement of micro-scope and object so that a clear image may be seen, is called focusing).When a clear image is… … i** Fig. 16. Diagram of the simple microscope show-ing the course of the rays and all the images, andthat the eye forms an integral part of it. A1 B\ The object within the principal focus. A*B3. The virtual image on the same side of the lensas the object. It is indicated with dotted lines, as ithas…
Microscopy
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-401-278.webp)
