incident ray-the light ray striking a reflecting surface is called the incident ray.
reflected ray-the light ray obtained after reflection from the surface, in the same medium in which the incident ray is travelling , is called the reflected ray.
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Yes. The angle of incidence and reflection are equal.
The angle of incident is 45 degrees. The incident and reflected ray have the same magnitude and if the sum of the magnitudes is 90 degrees the incident is 45 degrees.
The angle of reflection is 140/2 = 70 degrees. The angle of reflection is the same as the the same as the incident.
The normal to the reflecting surface.
The angle between the incident ray and reflected ray is known as angle of deviation due to reflection. This will always be equal to 2i. Here i is the angle of incidence. So if 2i = 90 then i = 90/2 = 45 So the angle of incidence has to be 45 deg