Common types of industrial motor controls include, but are not limited to, combination starter, industrial pump, magnetic coil, magnetic contactor, magnetic starter, manual starter and control relay.
Refraction of Light. Refraction is the bending of a wave when it enters a medium where its speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray toward the normal to the boundary between the two media. The amount of bending depends on the indices of refraction of the two media and is described quantitatively by Snell's Law.
Best Answer: When light travels from a more dense medium into a less dense medium, it refracts (bends) away from the normal (normal meaning a line perpendicular to the surface). The greater the difference in densities, the greater the refraction. Also, when light hits the surface at a great angle, the refraction will be greater; if it hits straight on, there is no refraction. Whenever light hits a boundary between to mediums, a portion of the beam also reflects back into the original medium.