Oldal 31 [31]
b:
REFLEXIONS IN SMOOTH WATER 11
Suppose the whole of the objects composing the scene be¬
fore 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,