Principle of reversibiity is commonly used in reference to light. It simply states that if the path of travel of light is reversed, it will retrace its path. In other words, it will follow the same path when it was incident on the surface (or interface). Imagine what happens when we try to take our own picture using a camera or a mobile phone (with its main camera, that is, rear camera) by standing in front of a (plain) mirror. If a flash is used, the light from the flash will be reflected by on its own path and onto the flash itself, and that is why the flash is never clearly seen in such pictures. One can simply stand in front of a plane mirror with a small torch and see the light reflected back onto itself, thus demonstrating the principle of reversibility.
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