is it possible that the existence of two different angle of incidence of a single angle of deviation

Yes

Explanation:

It is possible that the existence of two different angle of incidence of a single angle of deviation.

This is possible according to the principle of the reversibility of light which explains its formed in a prism.

When a ray is incident on the first surface it then emerges out of the second surface and could allow another ray to be incident on second.

i think the answer is a and b

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