The Beginners Guide to the Microscope With a Section On Mounting Slides
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In our eReader you can find the full English version of the book. Read The Beginners Guide to the Microscope With a Section On Mounting Slides Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Beginners Guide to the Microscope With a Section On Mounting Slides
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To quickly assess the difficulty of the text, read a short excerpt:
This is called " diffraction, " and when the light from a condenser 32 THE BEGINNER S GUIDE is focussed on a transparent object there is not only the shadow picture of that object to be found in light and shade on our aerial screen, but the lens receives all these diffraction fans of light which can pass its aperture and brings them into proper focus at their anti-point. Now, the larger the aperture, the greater the diameter of the diffracted fan received and the Fig. 24. How an Image is formed... in the Microscope.
finer the quality of the built up image. It is found that the wide aperture lenses are capable of much superior definition than those of narrow angle lenses, and for obtaining pictures of an object lying all in one plane and very thin the former are much more desir- able. This remark refers, of course, to the higher powers mostly, although in low power work lenses of large aperture define better than those of small. The lenses of small aperture have the advantage if objects are thick, inasmuch that the cone of light received being more pointed owing to the narrower base, a greater thickness of the object, or several planes of the object can be passably good focus at one time.
What to read after The Beginners Guide to the Microscope With a Section On Mounting Slides?
You can find similar books in the "Read Also" column, or choose other free books by Charles E Heath to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
This is called " diffraction, " and when the light from a condenser 32 THE BEGINNER S GUIDE is focussed on a transparent object there is not only the shadow picture of that object to be found in light and shade on our aerial screen, but the lens receives all these diffraction fans of light which can pass its aperture and brings them into proper focus at their anti-point. Now, the larger the aperture, the greater the diameter of the diffracted fan received and the Fig. 24. How an Image is formed... in the Microscope.
finer the quality of the built up image. It is found that the wide aperture lenses are capable of much superior definition than those of narrow angle lenses, and for obtaining pictures of an object lying all in one plane and very thin the former are much more desir- able. This remark refers, of course, to the higher powers mostly, although in low power work lenses of large aperture define better than those of small. The lenses of small aperture have the advantage if objects are thick, inasmuch that the cone of light received being more pointed owing to the narrower base, a greater thickness of the object, or several planes of the object can be passably good focus at one time.
What to read after The Beginners Guide to the Microscope With a Section On Mounting Slides?
You can find similar books in the "Read Also" column, or choose other free books by Charles E Heath to read onlineMoreLess
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