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bomba923
Nov6-05, 01:56 AM
Ok...well, here goes:
Let's say we draw a slope-field for

\frac{{dy}}{{dx}} = \frac{x}{{k - y + \sqrt {x^2 + \left( {k - y} \right)^2 } }}

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Now, let's say a ray of light traveling in the direction \left\langle {0, - 1} \right\rangle "hits" one of the slope segments we drew. However, each "slope segment" is a actually a short planar mirror!!

And so,

*Regardless of which segment this light ray strikes, will the light ray be reflected through the point (0,k) ?
(assuming this ray strikes one and only one "mirror"/slope-segment)

mathphys
Nov22-05, 10:30 AM
Rewrite the equation for dy/dx taking dy/dx=C where C is an arbitrary constant, what curve the resulting equation represents? What properties has such a "mirror"? To what point the ray will be focused?