Science Lectures At South Kensington volume 1
Science Lectures At South Kensington volume 1
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In our eReader you can find the full English version of the book. Read Science Lectures At South Kensington volume 1 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 Science Lectures At South Kensington volume 1
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In dissecting and in preparing objects they are very useful, because all the motions of the hand are seen in the natural direction. We are, however, limited very much in their use MICROSCOPES. 195 since, in order to get very high magnifying powers, the focal length must be very short, and then the objects are so very close to the lens that it is almost impossible to perform any necessary operations under them.
Independently of the so-called spherical aberration, we have to contend with what is ...called chromatic aberration. As I have said, the spherical aberration might be overcome if it were possible to grind elliptical or hyperbolic lenses ; but even then we should still have to contend with what is called chromatic dispersion. When light is passed through a prism with inclined faces, it is more or less bent out of its original course ; but the different rays are thus refracted to a different extent, the blue rays being much more bent than the red rays and the green to an intermediate extent.
What to read after Science Lectures At South Kensington volume 1?
You can find similar books in the "Read Also" column, or choose other free books by Samuel Putnam Avery to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In dissecting and in preparing objects they are very useful, because all the motions of the hand are seen in the natural direction. We are, however, limited very much in their use MICROSCOPES. 195 since, in order to get very high magnifying powers, the focal length must be very short, and then the objects are so very close to the lens that it is almost impossible to perform any necessary operations under them.
Independently of the so-called spherical aberration, we have to contend with what is ...called chromatic aberration. As I have said, the spherical aberration might be overcome if it were possible to grind elliptical or hyperbolic lenses ; but even then we should still have to contend with what is called chromatic dispersion. When light is passed through a prism with inclined faces, it is more or less bent out of its original course ; but the different rays are thus refracted to a different extent, the blue rays being much more bent than the red rays and the green to an intermediate extent.
What to read after Science Lectures At South Kensington volume 1?
You can find similar books in the "Read Also" column, or choose other free books by Samuel Putnam Avery to read onlineMoreLess
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