< Page:The wonders of optics (1869).djvu
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OPTICAL INSTRUMENTS.

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The object to be looked at is placed at a (fig. 38), on a piece of thin glass usually called a slide. A small

The Compound Microscope.
Fig. 37.—The Compound Microscope. converging lens placed at b collects the rays proceeding from the object, and transmits them as far as c d, where they come under the influence of a second converging

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