Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 183
the outer edge converge some-what. These rays will come together to a focus and thenspread out again. Now a parabola is a curve which exactly overcomes thisdifficulty. All tsljs which start out from its principal focuswill be reflected parallel to its axis (Fig. 200). Searchlightand headlight… … CHAPTER XXVIII Refraction 203. Familiar Examples of Refraction. Everyone hasobserved the peculiar appearance of an oar or a stick when itis held in the water so as tomake an oblique angle with thesurface. Just at the surface thestick is abruptly bent as shownin Fig. 201. From this figure we see…
Physics
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