How can we measure visible light? The electromagnetic spectrum includes all forms of light energy, known as electromagnetic radiation. (1) Different types of electromagnetic radiation such as radio ...

Each colour within the visible light spectrum has its own narrow band of wavelength and frequency. An object appears to be black if it absorbs all the wavelengths of visible light. For example ...

There are three primary colours of light, which can be combined to make secondary colours. A rainbow contains all the colours of the visible spectrum. It is often possible to see a secondary bow ...