Lenses and systems of lenses, treated after the manner of Gauss (1884)
Pendlebury, Charles · Cambridge, Deighton, Bell, and Co. · leaf 58
Points. 70. It may be noticed that conversely if any straight lineparallel to the axis, meet the Principal Planes at the pointsP and P respectively, then P and P are conjugate to oneanother. 71. To determine geometrically the position of a point Pwhich is conjugate to a given point P. SEFEACTION AT… … We know from the definition that all the rays from Pwill, after refraction, pass through P; hence it will befiuflScient to find the ultimate intersection of any two ofthem. We will select that which proceeds from P in the direc-tion Pa, parallel to the axis, and which meets the firstPrincipal Plane…
Lenses
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