No, it is not an optical illusion.
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"Any light beam moving vertically downwards in the concavity of the parabola (parallel to the axis of symmetry) will bounce off the parabola moving directly towards the focus." http://en.wikipedia.org/wiki/Parabola
parallel lines never meet. it is an optical illusion
- un prestidigitateur (the man doing the illusion), une prestidigitatrice (fem.). They are also called " illusioniste " or " magicien ". - la prestidigitation (fem.) (the sleigh of hand itself).
A parabola has no endpoints: it extends to infinity.A parabola has no endpoints: it extends to infinity.A parabola has no endpoints: it extends to infinity.A parabola has no endpoints: it extends to infinity.
No. If you tilt a parabola, you will still have a parabolic curve but it will no longer be a parabola.