Laurence, Lionel · London, School of Optics · leaf 174
pparently emerges, is the second equivalent point.Ey and E2 have the same properties as in thin lens combinations, i.e. theyare the points from which the principal and secondary foci are measured, 161 11 162 GENERAL AND PRACTICAL OPTICS and through which pass the planes where all refraction is… … Fig. 174. Fig. 175. In periscopic Cx. or Cc. lenses (Figs. 174 and 175) both E1 and E2 generallylie outside the lens on the Cx. side of the PCx., and on the Cc. side of thePCc, but in some cases the one point may be outside, and the other stillwithin the lens; moreover the optical centre 0 lies…
Optics
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