Natural philosophy. being a hand-book of chemical physics, or, The physics of heat, light and electricity (1869)
Sangster, John Herbert, 1831-1904 · Montreal : J. Lovell · leaf 100
—.y-A ,238. The point to which a con- ^cave mirror reflects the rays inci-dent upon it, is called the focus or fire place of the mirror ; and thefocus for parallel rays, as Fin Fig. 24, is called its principal focus. 239. Diverging rays incident upon a concave mirror are reflect-ed to a focus, /,… … I. As P approaches the mirror/recedes from it.IT. When P coincides with C, the geometrical centre of curva-ture,/is also coincident with c. III. When P approaches the mirror so as to take the position/, the focus/has receded so as to assume the position P. IV. When P reaches the point F, the…
Physics
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