ON AT PLANE SURFACES. 51 visible by blowing some smoke above the surface of the water.The fluorescence of the cosine marks its path in the water andthe refraction on entrance is clearly seen. By arranging a graduated circle on one face of the tankin such a way that the beam is incident on the water… … Fig. 34. (c) Place a stick or pencil obliquely in a vessel of waterand look at it sideways. The stick appears bent where itenters the water. The rays diverging from any point on thestick are refracted downwards where they meet the water andenter the eye appearing to diverge from a point nearer…
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