If a vector 
has components 
then the angle that this vector makes with the positive x -axis must be in the range
Definitions:
Refraction
Refraction is the bending of light as it passes from one medium to another, which changes its speed and direction.
Transcendence
The act of going beyond ordinary limits; in psychology, it refers to peak experiences that surpass normal perceptions, behaviors, and awareness.
Absolute Threshold
The minimum intensity of a stimulus that is required for a person to be able to detect it 50% of the time.
Noticeable
Easily seen or recognized; attracting attention by being prominent or significant.
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