For a plane mirror, which angles are always equal to each other?

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1. For a plane mirror, which angles are always equal to each other?

Only the angle of incidence and angle of refraction

Only the angle of incidence and angle of reflection

Only the angle of refraction and angle of reflection

The angle of incidence, refraction, and reflection, all three

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A plane mirror reflects light without any refraction taking place at all, so only the angle of incidence and the angle of reflection are meaningfully equal here.