(10) flat on a sheet ofpaper fastened to the drawing-board and mark its outlineABCD (fig. 50) on the paper. 43-44] REFRACTION AT PLANE SURFACES. 71 Put two pins P, P into the board in such a position thatthe line joining their feet may meet the glass obliquely as atR. Look at the pins through the… … Fig. 50. a ray incident along PR is refracted through the glass alongRQ and emerges along QS. Remove the glass and join RQ.The path of a ray through the glass is thus traced. ProduceSS backwards. It will be found that SS, and PP are parallelThe ray emerges parallel to its direction before…
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