explain this figures and deviation

Deviation can be defined as the angle by which the original ray has been reflected because of reflections.
It can be measured by finding the angle between original path of ray and reflected ray.

In the first case, the original ray traversing making angle i with normal and thus after reflection it get reflected and making angle r with normal , but i=r, so total deflection is , 180-2i.
similarly in the second diagram angle between original ray and reflected ray is 360-2i.

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