The Theory of Optical Instruments
The Theory of Optical Instruments
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In our eReader you can find the full English version of the book. Read The Theory of Optical 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 The Theory of Optical Instruments
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Comparing these two equations, we have 1 l-ak z = FA --' These equations determine the focal length of the lens and the position of its first principal focus ; the position of the second principal focus F' is similarly given by the equation K The position and size of the image are therefore given by the equations 1 x T^ 2, where F I x, and y. -j^-, Kx which completely determine the image-forming action of the lens.
The distance of the vertex A from the first principal point H is ( 8) IT A T? A .../" L"~ 2 ^ 2 HA-1A-J-- _ r _-__-_, and the distance of the second principal point from the vertex B, measured outwards from the lens, is similarly - akJK. The distance between the principal points is therefore t a (k l + k^)jK ; or if t be small compared with the focal length, it is approximately (/x - 1) t\i*..
It is easily seen from the above formulae that generally speaking the effect of the thickness in a double-convex lens is to decrease the converging power of the lens, while in a double-concave lens the thick- ness increases the diverging power.
What to read after The Theory of Optical Instruments?
You can find similar books in the "Read Also" column, or choose other free books by Whittaker, E. T. (Edmund Taylor), 1873-1956 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Comparing these two equations, we have 1 l-ak z = FA --' These equations determine the focal length of the lens and the position of its first principal focus ; the position of the second principal focus F' is similarly given by the equation K The position and size of the image are therefore given by the equations 1 x T^ 2, where F I x, and y. -j^-, Kx which completely determine the image-forming action of the lens.
The distance of the vertex A from the first principal point H is ( 8) IT A T? A .../" L"~ 2 ^ 2 HA-1A-J-- _ r _-__-_, and the distance of the second principal point from the vertex B, measured outwards from the lens, is similarly - akJK. The distance between the principal points is therefore t a (k l + k^)jK ; or if t be small compared with the focal length, it is approximately (/x - 1) t\i*..
It is easily seen from the above formulae that generally speaking the effect of the thickness in a double-convex lens is to decrease the converging power of the lens, while in a double-concave lens the thick- ness increases the diverging power.
What to read after The Theory of Optical Instruments?
You can find similar books in the "Read Also" column, or choose other free books by Whittaker, E. T. (Edmund Taylor), 1873-1956 to read onlineMoreLess
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