Lenses and systems of lenses, treated after the manner of Gauss (1884)
Pendlebury, Charles · Cambridge, Deighton, Bell, and Co. · leaf 30
e it will be enough to deter-mine the point of concurrence of any two. It happens that there are two rays, whose paths we knowfrom beginning to end ; namely, the ray which proceeds fromQ in a direction parallel to the axis, and the ray whichpasses through F. The former of these passes through F… … From Q draw QP parallel to the axis and meeting thetangent plane at the vertex at P. Join PF, and produce it.Again, join QF uni produce it to meet the tangent plane atP. Through P draw PQ parallel to the axis, and let itmeet PF produced at Q. Then, since the rays QP and QF meet after refraction…
Lenses
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