The wire that carries the current from the power source to the outlet or receptacle is the hot wire. Whenever you see a black wire, you know it is hot. There are other wires that carry current in more complicated circuits, but black are always hot.
The minimum angle at which total internal reflection occurs is known as the critical angle (for Perspex this is about 43Ë). At any angle greater than the critical angle, total internal reflection occurs and the light ray obeys the normal rules for reflection (i.e. angle of incidence = angle of reflection). 1  Page. 2  1. 3  2.
Definition. No. If there is no change in speed there is no refraction. If there is no refraction, there is no dispersion of light and hence, no rainbow! Term. The minimum angle of incidence for which a light ray is totally reflected within a medium is called the ______________ _______________. Definition. critical angle. Term. The 100% reflection (with no transmission) of light that strikes the boundary between two media at an angle greater than the critical angle is called _______ ________ ________.