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What (who) is beam divergence - definition
Beam divergence
HOW MUCH A BEAM EXPANDS AS IT TRAVELS
Beam spread; Laser beam divergence
In electromagnetics, especially in optics, beam divergence is an angular measure of the increase in beam diameter or radius with distance from the optical aperture or antenna aperture from which the beam emerges. The term is relevant only in the "far field", away from any focus of the beam.
Divergence
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VECTOR DIFFERENTIAL OPERATOR MEASURING THE SOURCE OR SINK AT A GIVEN POINT
Divergency; Spherical divergence; Div operator; Divergence of a vector field
In vector calculus, divergence is a vector operator that operates on a vector field, producing a scalar field giving the quantity of the vector field's source at each point. More technically, the divergence represents the volume density of the outward flux of a vector field from an infinitesimal volume around a given point.
Divergency
VECTOR DIFFERENTIAL OPERATOR MEASURING THE SOURCE OR SINK AT A GIVEN POINT
Divergency; Spherical divergence; Div operator; Divergence of a vector field
·noun Disagreement; difference.
II. Divergency ·noun A receding from each other in moving from a common center; the state of being divergent; as, an angle is made by the divergence of straight lines.
