Laurence, Lionel · London, School of Optics · leaf 189
e the powers of thetwo lenses, Tx and T2 their respective optical thicknesses, and d the distancein cm. between the adjacent equivalent planes of the two lenses. D=D1 + D2-D1D2tf/100 If d is expressed in terms of a metre ~D=D1 + ~D2-DlD2d The first equivalent plane E is distant from Ex of the first… … Fig. 198. F F Fig. 199. Strong Opposite Lenses.—It is difficult to get absolute neutralisationwith strong lenses, say over 10 D, there being always some slight positive move-ment. This is due to the thickness of the Cx., or rather to the intervalbetween the optical centres of the two lenses. As…
Optics
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