n two rays reflected respectively like AQ andAR from the two faces of a prism when the angle between thefaces themselves cannot be measured. In such a case theangle between the faces can be found by halving that betweenthe rays. The formulae -which have been used in the last Sections may beproved… … Fig. 54. Fig. 53. Again in fig. 54 draw RM, QN normals at R and Q meeting at M.Then R M Q + RAQ = two right angles and RMQ + RMN= two right angles. Hence RAQ=RMN=HRQ + MQR, Also D=QOT=ORQ + OQR = OEM- QRM+ OQM-RQM 44-45] REFRACTION AT PLANE SURFACES. 75 45. To find the image of a point formed…
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