Elementary Optics And Applications to Fire Control Instruments
Elementary Optics And Applications to Fire Control Instruments
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In our eReader you can find the full English version of the book. Read Elementary Optics And Applications to Fire Control Instruments 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 Elementary Optics And Applications to Fire Control Instruments
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For a simple positive lens the focal length is shorter for blue than for red light. Like spherical aberration, chromatic aberration is eliminated by making a lens of two separate lenses, one positive and one negative, placed together. The positive lens is made of a crown glass and the nega- tive lens of flint. The fundamental characteristic of flint glass is that the index of refraction varies much more for the different colors than is the case with the crown. The negative flint lens is so desi...gned that its variation of focal length with color, which is in the opposite sense to that of the crown, is sufficient to compensate for the varia- tions in the crown lens. But since the flint glass is used the negative lens does not neutralize the convergent effect of the crown component. The two lenses, together, therefore constitute a convergent lens with the chromatic aberration eliminated. It is the usual practice to make the two adjacent surfaces of the components of the same curvature so that they may be cemented together with Canada balsam, a transparent cement.
What to read after Elementary Optics And Applications to Fire Control Instruments?
You can find similar books in the "Read Also" column, or choose other free books by United States Army Ordnance Dept to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
For a simple positive lens the focal length is shorter for blue than for red light. Like spherical aberration, chromatic aberration is eliminated by making a lens of two separate lenses, one positive and one negative, placed together. The positive lens is made of a crown glass and the nega- tive lens of flint. The fundamental characteristic of flint glass is that the index of refraction varies much more for the different colors than is the case with the crown. The negative flint lens is so desi...gned that its variation of focal length with color, which is in the opposite sense to that of the crown, is sufficient to compensate for the varia- tions in the crown lens. But since the flint glass is used the negative lens does not neutralize the convergent effect of the crown component. The two lenses, together, therefore constitute a convergent lens with the chromatic aberration eliminated. It is the usual practice to make the two adjacent surfaces of the components of the same curvature so that they may be cemented together with Canada balsam, a transparent cement.
What to read after Elementary Optics And Applications to Fire Control Instruments?
You can find similar books in the "Read Also" column, or choose other free books by United States Army Ordnance Dept to read onlineMoreLess
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