The principles of light and color: including among other things the harmonic laws of the universe, the etherio-atomic philosophy of force, chromo chemistry, chromo therapeutics, and the general philosophy of the fine forces, together with numerous discoveries and practical applications .. . 3 is not refracted as it strikes the glass THE REFLECTION OF LIGHT. 397 perpendicularly; the electrical rays which are the most re-frangible come to a focus sooner than the others at or nearthe point E ; the luminous rays near L, and the heat rays nearH. If, therefore, in using a lens, the greatest heat be
The principles of light and color: including among other things the harmonic laws of the universe, the etherio-atomic philosophy of force, chromo chemistry, chromo therapeutics, and the general philosophy of the fine forces, together with numerous discoveries and practical applications .. . 3 is not refracted as it strikes the glass THE REFLECTION OF LIGHT. 397 perpendicularly; the electrical rays which are the most re-frangible come to a focus sooner than the others at or nearthe point E ; the luminous rays near L, and the heat rays nearH. If, therefore, in using a lens, the greatest heat be required, we must not expect it exactlywhere the light comes to the mostintense and dazzling point, but alittle beyond; if we wish thelargest quantity of the yellow prin-ciple without the electrical rays wemust bring the rays to a lumin- Fig. 174- A Convex Lens. ^ pQint Qn ^ object . jf WQ wish the electrical rays also, we must bring the lens a littlenearer to the object, while for the trans-violet rays it must bestill nearer. The more convex the surfaces of the lens are, theshorter will be the foci. Objects seen through a convex lensare magnified ; those seen through a concave lens are dimin-ished, exactly contrary to what is the case with objects seen inconvex and concave III. The Reflection of Light. I. This will be treated of here in only its salient points, andwith a desire to correct some misconceptions that scientists havefallen into on the subject. All reflection of light is caused bychemical repulsion. But here the critic may meet me with suchwords as these :— Have you not said that the reflection of lightis simply the rebound of incandescent particles of matter, inother words, of immensely elastic and minute fireballs ? Wouldyou assert that the bounding of a ball is an act of chemical re-pulsion ? The bounding of a mass of matter called an India rub-ber ball would not be chemical repulsion, in its ordinary sense,because chemical forces deal with atoms and
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