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One obvious property of light is that it reflects off of surfaces. Among other things, this gives rise to the images we see in mirrors, as indicated below.
Figure 10.1: Image formed from reflection of light in a mirror
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The reason that we see an image in a mirror as apparently coming from behind the mirror is that our eyes interpret the reflected light as originally coming from a point behind the mirror, as indicated in the figure. The image we see is upright and the same size as the original object.