Handbook of optics for students of ophthalmology (1899)
Souter, William Norwood, 1961-1935 · New York, Macmillan · leaf 56
emerges in a direction parallelto that before refraction. Such a ray undergoes onlya lateral displacement due to the thickness of thelens. We shall now demonstrate the method of findingthe focus Q, after refraction by a lens, of a pencilof light from a point P on the axis of the lens.The ray PR… … Fig. 16. surface of the lens and is refracted to Q. Then inthe first refraction Q is conjugate to P, and wehave from equation (a), page 30, n PA AQ r or, substituting / for PA, f for AQ, and F1 forr H 1 n = J_ a) Also in the second refracjbion Q is conjugate toQ; therefore, n 1 _ n — 1 m A7^…
Eye · Lenses
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