Final answer:
When a light ray hits a plane mirror at an angle of 30° to the mirror's axis, it is reflected at the same angle to the mirror.
Step-by-step explanation:
When a light ray hits a plane mirror at an angle of 30° to the mirror's axis, it is reflected at an angle of 30° to the mirror. This means that the angle of incidence is equal to the angle of reflection, and the reflected ray will have the same angle with respect to the mirror's axis as the incident ray.
For example, if the incident ray approaches the mirror at a 30° angle to the mirror's axis, it will be reflected back at a 30° angle as well.
The correct answer is C. The ray is reflected at an angle of 30° to the mirror.
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