e normal to the 4—2 52 LIGHT. [CH. IV glass surface at S is given by reading the position of thispatch P on the scale. Pour some water or other liquid into the tank filling itabout half full. • Two patches of light are now seen on the ground glass. Theone Q, fig. 35, is formed by light which has… … By varying the inclination of the tank to the beam oflight we vary the angle of incidence and can thus obtain aseries of values of the angle of incidence which we will denoteby <£ and the angle of refraction which we will call </>. Sucha series is given in the Table on page 53. Such a…
Heat · Light
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