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Does anyone have an absolute basic understanding of

"first order principles of energy dispersion"

(A) Energy from a point source disperses spherically

at the inverse square law.

(B) Energy from an infinite line source disperses cylindrically

at ½ inverse square law.

Question?

What is the energy dispersion from a finite line source?

Measured 90deg from center of line source, at distance x, where transition from ½ inverse square law, back to, inverse square law, takes place.

Can anyone throw light on this question without diversions?

1 First order principles only.

2 In space, zero boundaries.

3 Line length magnitudes greater than any wavelength of energy dispersed.

Thank you.