ny given face can emerge are few, and a largequantity of light is condensed into any one of these directions. 4O. Consequences of total reflexion, (a) To an eye placed under water, all external objects appear con-centrated into a certain conical space, the vertical angle of thecone being twice the… … Fig. 45. G. L. 66 LIGHT. [CH. IV Now the angle which RE makes with the vertical at E isthe same as the angle of refraction at R, and since PR isgrazing the surface this angle is the critical angle. The objectP will appear raised, being visible as at Q in the direction ER.Any object above P will be…
Heat · Light
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