Ocular refraction and the shadow test . Figure effects cf corresponding prisms apices togetlier^u parallel rays of light. In figure 36, pairs of similar prisms base to base are shown,figure 53 shows the optical effect of pairs of similar prisms with theirapices together. C is the apex of the prisms A C B and D C E, the LENSES. ray K L is not refracted, but the rays R and S incident upon theidentical points G and H are refracted alike, and from being parallelare rendered divergent. Figure ^ illustrates a form of opticalinstrument having surfaces that are sections of a sphere so relat
Ocular refraction and the shadow test . Figure effects cf corresponding prisms apices togetlier^u parallel rays of light. In figure 36, pairs of similar prisms base to base are shown,figure 53 shows the optical effect of pairs of similar prisms with theirapices together. C is the apex of the prisms A C B and D C E, the LENSES. ray K L is not refracted, but the rays R and S incident upon theidentical points G and H are refracted alike, and from being parallelare rendered divergent. Figure ^ illustrates a form of opticalinstrument having surfaces that are sections of a sphere so related. :spher R, incident Figure 54. s; R, refracted cus; r. O, principal that they have certain optical properties. Figure 54 representsanother form of lens having two spherical surfaces so related thatthey create optical effects that are exactly the opposite of convex
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