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What is meant by the Angle of incidence and Angle of reflection?
The angle of incidence and reflection are reference to of a line normal or perpendicular to a surface. The incidence angle is the incoming ray angle relative to the normal line and the reflection is the outgoing angle relative to the normal line. Both angles are in the plane containing the normal line and the incidence ray.
Why is it easier to measure the angle of incidence an the angle of reflection n a flat surface?
When talking about reflection (normally with light), one works out the angle of incidence and the angle of reflection by drawing a line that is perpendicular (90 degrees) to the reflector and measuring the angle between this line and the ray of incidence/reflection. This line is called the normal line. It is easier to measure the angles of incidence and reflection on a flat surface, because it is easier to draw an accurate normal line.
What is the reflected angle for a light beam hitting a mirror?
The angle of the reflected ray with the normal line to the surface of the mirror is the same as the angle of incidence. Snell's law.
What is the angle between a plane mirror and the straight line joining the object and its image?
90 degrees (That line is the normal to the mirror.)
When measuring the angle of incidence and the angle of refraction the imaginary line drawn perpendicular to the surface at the point of the incidence is called?
It's called the normal.
