Introductory course of natural philosophy for the use of schools and academies. Ed. from Ganot's popular physics. By William G. Peck (1869)
Ganot, Adolphe, 1804-1887, Peck, William Guy, 1820-1892 · New York A.S. Barnes · leaf 303
Principal focal distance? Explain the course of the rays. What is sphericalaberration? ITow remedied? (300.) What are Conjugate Foci? What is theradiant ? Illustrate. When the radiant is at an infinite distance, where is the con-j ugate focus ? 300 POrULAR PHYSICS. When the radiant is anywhere on… … Fig. 191. If the radiant approach the lens, the corresponding focuswill recede from it, as is shown in Fig. 191. If the radiant is at the principal focal distance, the re-fracted rays will be parallel, that is, the corresponding focusAvill be at an infinite distance, as is shown in the upper…
Physics
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