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The angle of incidence and reflection are reference to of a line normal or perpendicular to a surface. The incidence angle is the incoming ray angle relative to the normal line and the reflection is the outgoing angle relative to the normal line. Both angles are in the plane containing the normal line and the incidence ray.
The answer depends on knowing what the plane mirror hhas a 20-degree angle relative to!
aspect
Means a device which measures the angle of the boom relative to horizontal. Enable to determine measurements to a precision degree.
The answer depends on the curvature relative to the size of the pentagon.