Friday, June 5, 2015

optics - What is happening at a atomic level when light hits an object?


I just began learning light and optics and I am just so confused about what reflection, refraction and absorption is. I think a large part of my confusion stems from exactly what happens at an microscopic level when light hits an objects that causes it to be either reflected, refraction and absorbed? Like during reflection, does the object not absorb and transmit light at all, causing it to have no choice but to bounce back?




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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 \...