the diagram shows that the light reflects off the shadow of the tree/mirror in such as the manner that the angle of incidence is equal to the angle of reflections. It just so happened that the light travels along the line of sight to your eye follows the law of reflection.
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Answer:
the diagram shows that the light reflects off the shadow of the tree/mirror in such as the manner that the angle of incidence is equal to the angle of reflections. It just so happened that the light travels along the line of sight to your eye follows the law of reflection.