Lets Know About "Light" & Test Your "Eyes"

The "visible light" here is the light redirected that can not be seen by the human eye, see electromagnetic radiation. For other uses, see Lighting (unwanted) and visible lighting (unwanted).

Light electromagnetic radiation in a specific part of the electromagnetic spectrum. The word usually refers to visible light, which is visible from the eyes of the person and is responsible for the outlook. [1] The visible light is generally defined as having wavelengths between 400-700 nanometers (nm), or 4.00 × 10-7 to 7.00 × 10-7m in infrared (with long wavelength) and ultraviolet (with small wavelengths). . [2] [3] This wavelength refers to a frequency range of approximately 430-750 terhahart (THz).

Sun is the main source of light in the world. Sunlight provides energy that green plants mostly cause sugar in the form of starch, which liberates energy in living objects which they digest. This process of illumination provides virtually all the power used by living things. Historically, another important source of light for humans is fire, from ancient campfire to modern kerosene lighting. With the development of electrical lights and power systems, the electric lighting has effectively replaced the negotiation space. Some species of animals produce their own light, the name of a process is Billimisense. For example, firefalls use light to detect partners, and vampire squids use it to hide themselves from the victims.

The initial features of visible light are intensity, expansion instruction, frequency or wavelength alphabet and polarization, while its speed in vacuum, 2979792458 meters per second, is one of the basic constants of nature. Visible lighting, such as all electromagnetic radiation (EMR), is always used to run on vacuum at this pace. [4]

In physics, the term refers to the electromagnetic radiation of the wavelength of light, whether visible or not. [5] [6] In this sense, gamma ray, x-ray, microwave and radio waves are also light. In all light, the visible light emits and absorbs the small "packets" photon and displays both the characteristics of waves and particles. The wave particle of this property is referred to as dual. Light research, known as optics, is an important research area of ​​modern physics.