Search Results for “envelope”
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parabola envelope
We use a trick to let the trace "open up" as you drag a point. The trick is this: an initial point is given parametric location s*t, create a tangent at this point and its envelope as s varies. Now hide the original point and create another point with parameter t, and make it draggable. Dragging the new point changes the value of t and we see a trace from 0 to t.![](/apps/thumbs/180.png)
And the envelope please...
What is the phantom curve you see when you look at a set of lines, perpendicular to a set of chords through a common point in a circle?![](/apps/thumbs/315.png)
Coffee Cup Caustic
You can move the light source and observe the changes in the reflected rays which form the caustic.![](/apps/thumbs/272.png)