ithR the point of incidenceas centre and radii RA, RBsuch that RB = fjiRA, de-scribe two circles, fig. 38.Draw the incident ray PRcutting the circle with radiusRA in P. Through P drawLPQ normal to the surfaceto meet the second circle inQ. Join QR and produceit to Q, then RQ is the re-fracted ray.… … 58 LIGHT. [CH. IV a straight rod representing the normal to the refracting surface. A rectangular bar of thin brass is convenient. To this a sliding piece R is attached which can move up and down the rod. At R a rod PRQ is pivoted and R Q are joined by a third rod pivoted at R and Q. The lengths…
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