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.
Image by Flickr.com, courtesy of Jule_Berlin. In relation to your eyes, refraction refers to how light waves bend as they pass through your cornea and lens. Your eye's ability to refract light determines its ability to focus light, which establishes how well you see. Your eye has a refractive error if it cannot focus an image sharply. Determining the lens prescription needed to correct the error is called a refraction or refraction assessment. Your eye's ability to refract light depends on the overall length of the eye and the curvature of the eye's surface (cornea).