Friday, June 2, 2017

optics - How does light know which path is fastest?


We know from Fermat's principle of least time that light follows the fastest path. But how does light know which path is the fastest?





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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...