The student's guide to diseases of the eye . Fig. 1.—Refraction by a medium with parallel Fig. 2.—Refraction by a prism. with b. The angle a is the refracting angle oredge of the prism ; the opposite side is the figure shows that light is always deviated to-wards the base. Crown glass prisms cause a devia-tion (represented by the angle d) equal to abouthalf the refracting angle of the prism. The rela- OPTICAL OUTLINES tive direction of the rajs is not changed bj a prism ;if parallel or divergent before incidence they areparallel or similarly divergent after emergence (Fig- 3.)
The student's guide to diseases of the eye . Fig. 1.—Refraction by a medium with parallel Fig. 2.—Refraction by a prism. with b. The angle a is the refracting angle oredge of the prism ; the opposite side is the figure shows that light is always deviated to-wards the base. Crown glass prisms cause a devia-tion (represented by the angle d) equal to abouthalf the refracting angle of the prism. The rela- OPTICAL OUTLINES tive direction of the rajs is not changed bj a prism ;if parallel or divergent before incidence they areparallel or similarly divergent after emergence (Fig- 3.)- ___
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Keywords: ., bookcentury1800, booksu, booksubjecteye, booksubjectophthalmology
