Saturday, August 29, 2015

optics - With a box that has perfect mirrors on the inside would it be possible to trap light?



With a box that has many perfect relective mirrors, would it be possible to trap a beam of light in the box indefinetly?




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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 \...