Saturday, August 20, 2016

optics - Why do light rays intersect (or appear to intersect) at a specific point on reflection from spherical mirror?


Consider a spherical (say concave) mirror. Let an object be placed beyond its focus so that a real image is formed on reflection. The location of the image is found by considering a point on the object as a point source, drawing a couple of light rays from it, and finding their point of intersection on reflection.


My question is how do we know that all the other infinite light rays that can be drawn from the point source will also intersect at that same point on reflection?




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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 \...