A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 615
urface which does this is called an aplanatic surface. Spherical surfaces as a rule are not aplanatic. Consider a sphere of glass of radius r =OC, having centre at O (Fig. 540). Draw also two circles having their centres at O, one having radius fxr and the other rjfu Thus BO = //>- and AO =… … FIG. 540.—Refraction at aplanatic surface. XLVI LENSES 591 But BOOC _BCO = _ECD, and <lOBC=<iOCA; sin ECD Wl=lx- sin OCA It follows that for an incident ray AC, the refracted ray is CD ; andall other rays that leave A and emerge from the sphere, in a mannersimilar to CD, will travel after…
Physics
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