. The microscope; an introduction to microscopic methods and to histology. Microscopes; 1899. CH. /.] MICROSCOPE AND ACCESSORIES. 31 Observe that the image seen through the simple microscope is merely an enlargement of the one on the screen, and that the letters remain inverted, that is they appear as with the naked eye (§ 9). Remove the screen and observe the aerial image with the tripod. Put a 50 mm., (A, No. 1, or 2 in.) ocular (z. e., an ocular of low magnification) in position (§ 44). Hold the eye about 10 to 20 milli- meters from the eye-lens and look into the microscope. The letters wil
. The microscope; an introduction to microscopic methods and to histology. Microscopes; 1899. CH. /.] MICROSCOPE AND ACCESSORIES. 31 Observe that the image seen through the simple microscope is merely an enlargement of the one on the screen, and that the letters remain inverted, that is they appear as with the naked eye (§ 9). Remove the screen and observe the aerial image with the tripod. Put a 50 mm., (A, No. 1, or 2 in.) ocular (z. e., an ocular of low magnification) in position (§ 44). Hold the eye about 10 to 20 milli- meters from the eye-lens and look into the microscope. The letters will appear as when the simple microscope was used (see above), the image will become more distinct by slightly raising the tube of the mi- croscope with the coarse adjustment. § 53. The Function of the Ocular, as seen from the above, is that of a simple microscope, viz. : It magnifies the real image formed by the objective as if that image were an object. Compare the image formed by the ocular (Fig. 21), and that formed bj' a simple microscope (Fig. 38). It should be borne in mind, however, that the rays from an object as usually examined with a simple microscope, extend from the object in all directions, and no matter at what angle the simple microscope is held, provided it is sufficiently near and points toward the object, an image may be seen. The rays from a real image, however, are continued in Fig. 38. Diagram of the simple microscope show ing the course of the rays and all the images, and that the eye forms an integral part of it. A1 B'. The object within the principal focus. A3 B3. The virtual image on the same side of the lens as the object. It is indicated with dotted lines, as it has no actual existence. Bl A\ Retinal image of the object {A1 Bl). The virtual image is simply a projection of the retinal image in the field of vision. Axis. The principal optic axis of the microscope and of the eye. Cr. Cornea of the eye. L. Crystal- line lens of the eye. R. Ideal refrac
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