Tuesday, May 27, 2014

waves - Double slit experiment in reverse


What would one observe if instead of using a point source to illuminate the two slits a screen parallel to the two slits where portions of the screen are brighter and darker according to the relevant interference pattern, picture related.


I would expect the light to have a focus at one point based on Fermat's principle of ray reversibility in optics but I am unsure if that would apply here this being a wave phenomena. enter image description here




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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 \...