Editing Launch angle

In [[fiber optics|fiber optic]] [[telecommunications]], the '''launch angle''' has the following meanings: 

*The angle, with respect to the normal, at which a [[light]] [[line (mathematics)|ray]] emerges from a surface. 
*The [[beam divergence]] at an emitting surface, such as that of a [[light-emitting diode]] (LED), [[laser]], [[lens (optics)|lens]], [[Prism (optics)|prism]], or [[optical fiber]] end face. 
*At an end face of an optical fiber, the angle between an input ray and the [[fiber axis]]. If the end face of the fiber is perpendicular to the fiber axis, the launch angle is equal to the [[angle of incidence (optics)|angle of incidence]].

In [[baseball]], the "launch angle" is the angle, with respect to the ground level at home plate, at which a batted ball leaves the bat.

==References==
{{FS1037C MS188}}

[[Category:Fiber optics]]


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