The A labelled ray is the incident ray, label B is normal of incidence and label c is angle of incidence.
To identify label A, B and C, we need to know more about incident ray, normal of incidence and angle of incidence.
What is incident ray?
The ray which is incident on any plane is known as incident ray for that plane.
What is normal of incidence?
The imaginary perpendicular line drawn to the plane of interface through the point on the interface where the incident ray touches the interface is known as normal of incidence.
What is angle of incidence?
The angle between the incident ray and normal of incidence is known as angle of incidence.
Thus, we can conclude that the label A line is the incident ray, label B line is normal of incidence and label C is angle of incidence.
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