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b: REFLEXIONS IN SMOOTH WATER 11 Suppose the whole of the objects composing the scene before us to be actually inverted beneath the level of the water, forming a solid image, and the surface of the water to be an opening through which this image can be seen; then the reflexion that we see in the water, at whatever point we may be standing, ts simply our view of the inverted image from that point. Thus we geta different view of the image as we change our position, the extent of our view being limited by the size of the sheet of water. This is illustrated in Fig. 4, which 1s intended to represent the section of a river-bed with its imaginary inverted "double, " AB being the surface of the water. Standing at the point C, our view of the image of the house is limited by the further bank at B. It permits us only to see that part of the inverted house which appears to be below d. In other words,
