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)
rface, and they will, if continued, jiassthrough the centre A. The ray 1 will be reflected to E, in such adirection that the angle of reflection, between E and H, will equal theangle of incidence, between 1 and H ; and so with the ray 3. If E andF be continued, as shown by the dotted lines, they… … 312 OPTICS. The point, V, is theprincijml foc7is of the mirror, and, for parallel rays,is situated equally distant from the mirror and its geometrical centre,A; and, being behind the mirror, is called the j^ritici^ial viHual focus. Converging rays would seem to meet at a point between the…
Physics · Astronomy
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