Fig. 56 (a). … Fig. 56(6). 45] REFRACTION AT PLANE SURFACES. 77 be the refractive index from air into the denser medium,we have or AQ = -AP. The two cases are shewn in figure 56 (a) and (b). It is inconsequence of this, that a pool of water looks less deep thanit is really. The conclusions just stated are it must…
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