llow the light to fallon it in a horizontal direction. On looking downwards on toit the surface of the tube is as bright as a mirror; the lightcannot pass from the glass into the air in the tube but istotally reflected up. Pour water into the tube, the reflexionceases, the part filled with water… … Fig. 44. 1 It is true that the light has not travelled directly from water to airbut has traversed the glass. If the faces of this are parallel however, therefraction through the glass plate makes no difference in the result. SeeSection 41. 64 LIGHT. [CH. IV refracted ray corresponding to a given…
Heat · Light
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