Understanding Matter and Energy
The Light Spectrum
Primary Colours of Light
How Light Travels
A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.
The Colours of the Rainbow - ROYGBIV
How to Princess Leia Hologram