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 ...

They're your eyes, and they receive signals that fall in the range of visible light. Light ... There's lots to discover in the electromagnetic spectrum. Here's a tour that begins with radio ...

Light from the lamp passed through a series of slits and mirrors and separated into the complete visible and UV spectrum at the prism. Once through the sample, the light collected in a phototube for ...