This article was originally published on the International Business Times. The human eye is capable of detecting the presence of a single photon, the smallest measurable unit of light, in the dark, ...

A nanocandela (ncd) is a unit of luminous intensity in the International System of Units (SI), equivalent to one billionth of a candela (cd). The candela measures the light emitted by a source in a ...

Human vision relies on light. After reflecting off surfaces, light enters into the eyes and travels through the cornea and pupil to produce an image on the retina. The eye is sensitive to a broad ...

If we are ever to fully harness the power of light for use in optical devices, it is necessary to understand photons -- the fundamental unit of light. Achieving such understanding, however, is easier ...