Puzzels
Usually, light beams shine in a straight line, with the possible exception of light being bent by gravity. But scientists are now investigating how to make light beams into looped and knotted configurations. The possibility for these structured light beams arises from some curious solutions to Maxwells equations, which describe the fundamentals of electricity and magnetism.
Lees meer ... Physorg
Physicists hope to tie light beams in knots
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