Visible light refers to the portion of the electromagnetic spectrum that is visible to the human eye. It includes wavelengths of light that range from 400 to 800 nanometers (nm), which correspond to the colors of the rainbow: red, orange, yellow, green, blue, indigo, and violet.
This range of wavelengths is significant because it is the only portion of the electromagnetic spectrum that is visible to the human eye. Wavelengths shorter than 400nm are considered ultraviolet light, while wavelengths longer than 800nm are considered infrared light.
Visible light is a form of electromagnetic radiation that behaves like a wave. It can be reflected, refracted, and diffracted, and it travels at a speed of approximately 299,792,458 meters per second. Visible light also has a dual nature, acting as both a particle (photon) and a wave.
Visible light has many practical applications in everyday life. It is essential for vision and allows us to see colors, shapes, and forms. It is also used in photography, communication systems such as fiber optics, and in various medical and scientific equipment, such as microscopes and spectrophotometers.
Using visible light beyond 400-800nm can have various implications depending on the specific application. For example, using shorter wavelengths (less than 400nm) can have harmful effects on living organisms, while longer wavelengths (greater than 800nm) can be used in medical imaging and remote sensing. It is essential to consider the potential effects and limitations when using visible light outside of its traditional range.