Light is electromagnetic radiation that falls within the visible part of the electromagnetic spectrum. Light travels as a series of transverse waves and does not require a medium for its propagation.
Light is described by its wavelength and frequency. The wavelength of visible light is 400 nanometers to 700 nanometers. Light travels with different speeds in solids such as glass and in liquids. The light from the sun is polychromatic light as it is composed of light of various colors. Monochromatic light is light of one color and wavelength. The speed of light in a vacuum is approximately 3,00,000 kilometers per second.