Luminescence caused by absorption of optical radiation Includes fluorescence and phosphorescence

Types of luminescence with special names typeĬaused by absorption of optical radiation (IR, light, UV) (in matter that may or may not be 'hot').

Luminescence is the emission of light when excited electrons fall to lower energy levels.

Incandescence is the emission of light from 'hot' matter (T ≳ 800 K).

Thomas Young (1773–1829) and Augustin-Jean Fresnel (1788–1827) disproved Newton's corpuscular theory.

Huygens stated that an expanding sphere of light behaves as if each point on the wave front were a new source of radiation of the same frequency and phase.

In 1678, Christiaan Huygens (1629–1695) published Traité de la Lumiere, where he argued in favor of the wave nature of light.The transverse nature of light can be demonstrated through polarization. Like all electromagnetic waves, light can travel through a vacuum. The wave nature of light was first illustrated through experiments on diffraction and interference. Light is a transverse, electromagnetic wave that can be seen by the typical human.

Light intensity to force equation