said to be deviated. The deviation ismeasured by the angle between the directions of the raybefore and after refraction. Thus, let PR, fig. 41, be a rayincident at R and refracted alongRQ. Produce PR to P. Theray was travelling before refrac-tion in the direction RP; afterrefraction it is moving in… … 37. Total reflexion. We have been dealing mainly,up to the present, with the refraction of light from a mediumsuch as air into one which is optically denser such as glass orwater. The geometrical constructions and the results willapply in general to the case of light travelling from glass orwater…
Heat · Light
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