Laurence, Lionel · London, School of Optics · leaf 116
R VIIICYLINDRICAL LENSES The Cylinder.—A cylinder is a body (Fig. Ill) generated by the revolu-tion of a rectangle about one of its sides as an axis. Such a body consists oftwo flat circular ends and an intermediate convex surface. The cylinder possesses no curvature in any plane parallel to the… … Fits. 111. Any section of the cylinder at right angles to its axis is a circle whosecentre lies on the axis of the cylinder; a section in the plane of the axis is aparallelogram; one anywhere between these two is an ellipse, as E F. Fig. 112 represents a Cx. cylindrical lens. It is a segment of a…
Optics
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