The Elements of Physics a College Text book volume 3
The Elements of Physics a College Text book volume 3
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In our eReader you can find the full English version of the book. Read The Elements of Physics a College Text book volume 3 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 Elements of Physics a College Text book volume 3
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Fig. 443.
LENS SYSTEMS. Fa When the magnification is other than - i, the combination remains sensibly orthoscopic. For photographic purposes it is customary to use in place of the lenses LL two similar achro- matic doublets. Such a combination is shown in Fig. 454.
679. Curvature of field. In order to project upon a screen the most distinct image of an extended flat object, which it is possible to form by means of a simple lens, the screen must be curved, as shown by 55 in Fig. 444. This imperf...ection of a lens is called curvature of field.
The curvature of field of a lens of given focal length varies with the refractive index of the glass, and is of opposite sign for converging lenses and diverging lenses. It is, there- fore, possible to combine a converging lens and a diverging lens of different glass, so as to form a doublet of any desired focal length which will give a fiat field. Flatness of field is very important in photographic objectives, because these are used to project images upon flat glass plates.
What to read after The Elements of Physics a College Text book volume 3?
You can find similar books in the "Read Also" column, or choose other free books by E L Edward Leamington Nichols to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Fig. 443.
LENS SYSTEMS. Fa When the magnification is other than - i, the combination remains sensibly orthoscopic. For photographic purposes it is customary to use in place of the lenses LL two similar achro- matic doublets. Such a combination is shown in Fig. 454.
679. Curvature of field. In order to project upon a screen the most distinct image of an extended flat object, which it is possible to form by means of a simple lens, the screen must be curved, as shown by 55 in Fig. 444. This imperf...ection of a lens is called curvature of field.
The curvature of field of a lens of given focal length varies with the refractive index of the glass, and is of opposite sign for converging lenses and diverging lenses. It is, there- fore, possible to combine a converging lens and a diverging lens of different glass, so as to form a doublet of any desired focal length which will give a fiat field. Flatness of field is very important in photographic objectives, because these are used to project images upon flat glass plates.
What to read after The Elements of Physics a College Text book volume 3?
You can find similar books in the "Read Also" column, or choose other free books by E L Edward Leamington Nichols to read onlineMoreLess
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