Handbook of optics for students of ophthalmology (1899)
Souter, William Norwood, 1961-1935 · New York, Macmillan · leaf 208
in high degrees of ametropia, sostriking that it must attract the attention of everystudent of ophthalmoscopy. APPENDIX I For the convenience of those who may not be familiarwith trigonometrical formulae, we append the followingsynopsis: In the figure, ABODE represents a quadrant, or 90degrees of… … AOB; similar!} Fig. 53. sine of COH. . CH OCOF is the BF OB OF is called the cosine of AOB, is the tangent, and —— the cotan-gent of this angle. The angle AOC is twice the angle AOB, but it isreadily seen that the perpendicular CH is less thantwice the perpendicular BF; hence the sine of twice…
Eye · Lenses
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