The angle between the ray which is refracted at a surface and the normal to that surface
The angle formed by a refracted ray and a perpendicular to the refracting surface at the point of refraction
The angle formed between the path of a beam and an imaginary line drawn perpendicular (at 90°) to the surface of the medium Look at Figure 7 13a Back to Chapter 7
Angle between the refracted ray of light and the normal drawn to the point of reflection
Angle between direction of motion of waves and a line perpendicular to surface the waves have been refracted from
The angle between the refracted ray and the normal drawn to the point of refraction
the angle between a refracted ray and a line perpendicular to the surface between the two media at the point of refraction