Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
ng at the intersection of the lines A and B. If the radiant be placed, instead of on the axis, on anij line (notmuch inclined to the axis) passing through the oj^tical centre (408),called a secondary axis, the corresponding focus Avill be on that line,and the laws which regulate the positions of… … Within the double convex lens draw sections of two prisms sothat their ansfles of refraction shall coincide wath the edges of the OPTICS. 231 lens, and their ojiposite sides with the axis of the lens, as repre-sented. Let the rays, H and K, be pa7aUel to the axis, and, by the lens, theyAvill be…
Physics · Astronomy
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