A trial run for corrections officers brought another 10,000 applicants. A bonus was increased access to demographic data. DAS could quickly determine where applications were from, and bolster recruiting in areas that did not respond. Applicants who did not have their own computers could use those in public libraries or state employment-development centers. Perfect' mirror promises good things in medicine, fiber optics and conservation Scientists at the Massachusetts Institute of Technology have devised a mirror that can reflect light at any angle with no loss of energy.
Mirrors come in two basic varieties.
The one you look into every morning to put on makeup or shave is metallic. It reflects well, but it's wasteful. Because metallic mirrors absorb light, they cannot be used in communications or high-powered lasers, where limited energy loss is essential. Scientists use dielectric mirrors for communications and high-powered lasers. Dielectric mirrors can be made to transmit infrared light.