Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 336
ch falls perpendicularlyupon the surface, emergesas TiiA, in the same line.The rays on each side arerefracted as shown in thefigure, but the ray PB uponrefraction just skims along the surface. What becomes of a ray such as PC ? It cannot emerjre into the air, and so it is reflected back into the… … Fig. 370.—PB is the critical ray, and PBn (whichis equal to BPm) is the critical angle for waterand air. 326 V REFRACTION is equal to BPm. Hence if the angle of incidence of anyray is greater than PBii it will suffer total reflection. Thisangle is called the critical angle which may be…
Physics
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