The student's guide to diseases of the eye . Fig. 4.— Refraction thesame for different anglesof incidence. 4 OPTICAL OUTLINES convex lens, in which the angle (a) of the prism atthe edge of the lens is larger than the angle (/3). Fig. 5.—Refraction by a thin lens the same for all rays incidentat the same distance from the axis. of the prism nearer the axis,parallel rays (a and h) a will

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Keywords: ., bookcentury1800, booksu, booksubjecteye, booksubjectophthalmology