Laurence, Lionel · London, School of Optics · leaf 80
/ its image formed by refraction of the ray 0 D incident at D.From C draw the radius C D and let the angle A 0 D=a, A C D=6 andA I D—c. The indices of refraction of the first and second medium are ftxand [jl2. Then /j.x sin i=/bi2 sin r But i=a + b and r=b - c Therefore fjbx sin (a + 6)=ia2 sin (b… … Fig. 71. Let 0 A=fv A I=f2 and A C=r the radius of curvature.* 1\ Mi Un an ju2 Then Therefore 4j+-> M--7J or Vl+V±Jh_ fl2 - fl± The Focal Lengths and Powers of a Curved Surface.—The refractive power\/F of a curved surface depends on its curvature and the refractive index ofthe medium, so that an…
Optics
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