Physics Capsule

Light is an electromagnetic radiation. The process of separation of light into its component colours while passing through a medium is called as dispersion of light. The band of coloured components of a sunlight beam is called its spectrum. Various colours appearing in the spectrum are of the order as violet, indigo, blue, green, yellow, orange, and red. Different colours have different wavelengths which are visible to our eyes, that is, between 400 nm and 700 nm. Red light has maximum wavelength whereas violet light has minimum wavelength. The change in the direction of light rays while going from one medium to another medium is called refraction of light.