The microscope; an introduction to microscopic methods and to histology (1901)
Gage, Simon Henry, 1851-1944 · Ithaca, N.Y. Comstock publishing company · leaf 47
cipal focus.A= B3. The virtual image on the same side ofthe lens as the object. It is indicated by dottedlines, as it has no actual existence. B- A2. Retinal image of the object (A1 B1).The virtual image is simply a projection of theretinal image into the field of vision. Axis. The principal optic… … § 58. The field-lens of a Huygenian ocular makes the realimage smaller and consequently increases the size of the field ; it alsomakes the image brighter by contracting the area of the real image.(Fig. 30.) Demonstrate this by screwing off the field-lens and usingthe eye-lens alone as an ocular,…
Microscopy
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