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Zero.
The angle of incidence
Corresponding angles must be equal; in this case, that would be angle f. To prove that the two triangles are equal, you would have to prove that at least another pair of angles is also equal, for example, angle b equal to angle d. Or prove some other facts, like the ratio between certain corresponding sides.
The angle of reflection is equal to angle of incidence. Therefore angle of reflection will be also equal to 32.
The angle of incidence is ALWAYS equal to the angle of reflection! This is one of the laws of reflection.