om air; as the angle of incidence isincreased, the angle of refraction also becomes greater. Nowlet PR, fig. 42, be a ray in air which almost grazes the surfaceARE of the glass and let RQ be the corresponding refractedray. Let MRN be the normal at R. A ray travelling in the 1 Various other… … glass along QR will be refracted out into the air along RP. And any ray in the glass such as Q^R falling between QR and NR will also emerge as RP^ between RP and RM. But consider now a raysuch as Q^R between QR andthe surface of the glass.Since the angle which thisray Q^R in the glass makeswith the…
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