Vantablack is a super black coating developed in 2014 by Surrey NanoSystems, a British company. The materials to which this coating is applied absorb 99.965 percent of light. This makes it the blackest known man-made coating.
Photometry is the measurement of visible light as perceived by the human eye. Photometry is a name formed by combining the words photo and metry. Photo is a prefix meaning light. Metry refers to the process of measurement.
Blue light alone does not have a whitening effect. The purpose of the blue light is to speed up the teeth whitening process. It should be used with a bleaching solution. The combination of chemical and blue light significantly increases the final whiteness level of the teeth.
Light travels much faster than sound. One of the most classic examples is lightning. When lightning strikes, the first thing you see is a flash of lightning in the sky, while the sound of thunder is heard a few seconds later.
Light consists of small packets of energy called photons. Light energy is a form of electromagnetic radiation and is the only form of energy visible to the human eye. Light energy travels in waves and is very fast. The sun, stars, lamps, lasers, and hot objects are examples of light...
Italian physicist Galileo Galilei made a simple experiment with the help of lanterns in 1638. He and a friend each took a lantern and drove miles apart. As soon as one of them signaled with the lantern, the other gave the signal to him. Galileo divided the distance between two...
A light bulb we use at home everyday emits about one quintillion photons per second and hundreds of billions of photons included in the light are coming into our eyes. The light energy delivered to the eye plays a key role in maintaining normal biological activities including visual perception, circadian...