Inverse square law 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.