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    2021-7-4 · A laser is far more efficient in actual transmission. Despite divergence, it still does not follow the inverse square law that applies to a radiated energy like lightbulbs and stars (put simply, the strength of the energy per unit area drops as the reciprocal of the square of distance. At 2x unit distance, the strength is 1/4, at 3x, it's 1/9 ...

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