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Oh dear !!If a laser is sending a light beam/ray in one direction....how can I see the light beam from the side ?Isn't it traveling in a straight line ?.....does light emit light in all directions ?[attachment=1647]Quality drawing !!
Although the divergence of a laser beam is quite small it is not zero.The laser ranging beam that is used to check the Earth/Moon distance has am effective width of 4 Km when it reaches the Moon