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according to laws of reflection of light:
* angle of incident is equal to the angle of reflection
*the incident ray,the reflected ray and normal to the line of incidence all lie in the same plane.........
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Draw a perpendicular normal at the point of incidence on the boundary (interface ) between the reflecting media and the other medium.

1. The angle of incidence between the light ray and the normal to the boundary at the point of incidence  is equal to the angle of reflection between the reflected ray and the normal.

2.  Reflected ray, incident ray and the normal all lie in a single plane.

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