A ray of light strikes a mirror at an angle of 30 degree to the mirror surface. What is the angle of reflection?

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If I understand this question correctly, the angle of reflection should be 30 degrees with respect to the mirror as well.  The angle of the incoming ray and the angle of the ray that is reflected will always be the same.

The ray that is coming in is called the indcident ray and the angle that it makes with an imaginary line perpendicular to the surface of the mirror is called the angle of incidence.  The angle of incidence and the angle of reflection are always the same.  (This is true as long as the mirror is flat.)

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