. Practical physics. 0^0 (see footnote,p. 370); that is,by the departureof the curvedline cod from thestraight line co^d. have o,o„ = 2oo. Fig. 418. Reflection of a plane wave from aconvex mirror Since o^o was made equal to oo^, we that is, the curvature - of the reflected wave is equal to twice the curvature of the mirror, or hence/=-^ In other words, the focal length of - = 2 X-; nence/ = / J^ a mirror is equal to one half its radius. 447. Image of an object in a convex mirror. We are allfamiliar with the fact that a convex mirror always formsbehind the mirror a virtual,erect, and diminislie
. Practical physics. 0^0 (see footnote,p. 370); that is,by the departureof the curvedline cod from thestraight line co^d. have o,o„ = 2oo. Fig. 418. Reflection of a plane wave from aconvex mirror Since o^o was made equal to oo^, we that is, the curvature - of the reflected wave is equal to twice the curvature of the mirror, or hence/=-^ In other words, the focal length of - = 2 X-; nence/ = / J^ a mirror is equal to one half its radius. 447. Image of an object in a convex mirror. We are allfamiliar with the fact that a convex mirror always formsbehind the mirror a virtual,erect, and diminislied reason for this is shownclearly in Fig. 419. Theimage of the point P lies, asin plane mirrors (see § 444),always on the perpendicularto the mirror, but now neces-sarily nearer to the mirror than the focus F, smce, as the pointF is moved from a position very close to the mirror, where
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
