always on 0.
The word "origin" means the point (0, 0) on the x-y plane. The meaning of the phrase "origin of an object" is much less certain.
The origin.
Origin
A region in the complex number plane such that the line segment joining any of its points to the origin lies entirely in the region.
(0,0) = the origin
Cartesian Or the origin
See http://en.wikipedia.org/wiki/Complex_numberIn the complex number plane, it would be called the Origin, which has coordinates of (0, 0i)
The standard form of a complex number is the cartesian one; a plane with orthogonal axes for real parts and imaginary parts. A complex number has a pair of co-ordinates defining its position on the plane. A trigonometric form is a plane with an origin, and one line from the origin to infinity. A complex number is defined by its distance from the origin and the angle between the datum line and the line joining the number to the origin. It is just like co-ordinate geometry with co-ords r, theta instead of x,y.
a plane mirror (flat)
Think about it, the x & y planes intersect and what one number has both, the x & y planes intersect. 0 on the coordinate plane is the, origin.
If you are given a plane, you can always find and number of points that are not in that plane but, given anythree points there is always at least one plane that goes through all three.
A plane mirror will always create an upright image of 1/2 scale.