A report onLight

Electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye.

- Light

Michelson–Morley experiment

The Michelson–Morley experiment was an attempt to detect the existence of the luminiferous aether, a supposed medium permeating space that was thought to be the carrier of light waves.

Maxwell's equations

Maxwell's equations are a set of coupled partial differential equations that, together with the Lorentz force law, form the foundation of classical electromagnetism, classical optics, and electric circuits.

Maxwell's equations are a set of coupled partial differential equations that, together with the Lorentz force law, form the foundation of classical electromagnetism, classical optics, and electric circuits.

The speed calculated for electromagnetic waves, which could be predicted from experiments on charges and currents, matches the speed of light; indeed, light is one form of electromagnetic radiation (as are X-rays, radio waves, and others).

Sunlight

Portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light.

Portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light.

When direct solar radiation is not blocked by clouds, it is experienced as sunshine, a combination of bright light and radiant heat.

Energy

In physics, energy is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light.

Charge-coupled device

Integrated circuit containing an array of linked, or coupled, capacitors.

Integrated circuit containing an array of linked, or coupled, capacitors.

An image is projected through a lens onto the capacitor array (the photoactive region), causing each capacitor to accumulate an electric charge proportional to the light intensity at that location.

Wave interference

Phenomenon in which two waves combine by adding their displacement together at every single point in space and time, to form a resultant wave of greater, lower, or the same amplitude.

Phenomenon in which two waves combine by adding their displacement together at every single point in space and time, to form a resultant wave of greater, lower, or the same amplitude.

Interference effects can be observed with all types of waves, for example, light, radio, acoustic, surface water waves, gravity waves, or matter waves.

Physical magneto-optical phenomenon.

Physical magneto-optical phenomenon.

The Faraday effect causes a polarization rotation which is proportional to the projection of the magnetic field along the direction of the light propagation.

Neon sign

In the signage industry, neon signs are electric signs lighted by long luminous gas-discharge tubes that contain rarefied neon or other gases.

In the signage industry, neon signs are electric signs lighted by long luminous gas-discharge tubes that contain rarefied neon or other gases.

The color of the light emitted by the tube may be just that coming from the gas, or the light from the phosphor layer.

Incandescent light bulb

Electric light with a wire filament heated until it glows.

Electric light with a wire filament heated until it glows.

The useful part of the emitted energy is visible light, but most energy is given off as heat in the near-infrared wavelengths.