Notes On Light
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In our eReader you can find the full English version of the book. Read Notes On Light 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 Notes On Light
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Through D' draw a line D'P' perpen- dicular to the principal axis.
Again, light along some ray A J, not parallel to the principal axis, will emerge from the lens in some direction K I as though it had traversed the straight line AIL, thence the line L M parallel to the principal axis, and thence the straight line M K I.
That is, there are two planes perpendicular to the principal axis of a lens or lens system which possess the property that any inci- S2 PROPAGATION OF LIGHT dent ray meets the f...irst, and the corresponding emergent ray meets the second, in points equally distant from the principal axis. They are called the "principal planes" of the lens or lens system.
The points P and P' where the principal planes are cut by the principal axis are called "principal points." There are a pair of principal points for light of each color. In the case of most lenses, however, the principal points for all colors ai^e so nearly coincident that in the present discussion the departure will be neglected.
What to read after Notes On Light?
You can find similar books in the "Read Also" column, or choose other free books by Ferry, Ervin S. (Ervin Sidney), 1868-1956 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Through D' draw a line D'P' perpen- dicular to the principal axis.
Again, light along some ray A J, not parallel to the principal axis, will emerge from the lens in some direction K I as though it had traversed the straight line AIL, thence the line L M parallel to the principal axis, and thence the straight line M K I.
That is, there are two planes perpendicular to the principal axis of a lens or lens system which possess the property that any inci- S2 PROPAGATION OF LIGHT dent ray meets the f...irst, and the corresponding emergent ray meets the second, in points equally distant from the principal axis. They are called the "principal planes" of the lens or lens system.
The points P and P' where the principal planes are cut by the principal axis are called "principal points." There are a pair of principal points for light of each color. In the case of most lenses, however, the principal points for all colors ai^e so nearly coincident that in the present discussion the departure will be neglected.
What to read after Notes On Light?
You can find similar books in the "Read Also" column, or choose other free books by Ferry, Ervin S. (Ervin Sidney), 1868-1956 to read onlineMoreLess
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