What are the values of a. the angle of incidence and b. the angle of reflection for normal incidence on a plane mirror surface?

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Solution

The angle of incidence is the angle between the incident ray and the normal at the point of incidence.
If an incidence ray is normal to a surface that means the angle of incidence is $0^{o}$ .
According to the law of reflection, the angle of incidence is equal to the angle of reflection.
So the angle of reflection is also $0^{o}$ .
Final answer - For normal incidence on a plane mirror, angle of incidence and angle of reflection are $0^{o}$ .

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