Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 328
ent nearthe vertex pass accurately through the principal focus; if theangular aperture is large the outer rays after reflection passthrough points some distance from thefocus (see Fig. 346). Conversely, if a sourceof light is placed at the principal focus,the rays after reflection will not all… … FiQ. 360.—If a source of lightis placed at the principalfocus of a hemisphericalmirror the outer raysconverge and afterwardsdiverge again. Now a parabolic mirror overcomes this spread-ing of the rays. In Fig. 361 is shown a parabola.All rays wdiich emanate from the focus, afterreflection are…
Physics
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