-fracted at Q and thenthe path of RS refractedout at R. In this case Fig. 48. PQ produced and RS are not parallel but inclined, the ray is deviated by traversing theprism and we notice that in the figure the ray is turned fromthe edge to the base or thicker part of the prism. We can shew by… … 41-43] REFRACTION AT PLANE SURFACES. 69 43. Observations on refraction through platesor prisms, (a) Open the window; place an upright sticknear it and a second some distance within the room in such aposition that the two sticks and some well-defined mark out-side are in one straight line, i.e. so…
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