Rainbow

 

A Rainbow is an optical and Meterological 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 arc.

Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.

Rainbows can be full circles; however, the average observer sees only an arc formed by illuminated droplets above the ground, and centred on a line from the sun to the observer's eye.

Number of colours in spectrum or rainbow

Red	Orange	Yellow	Green	Blue	Indigo	Violet

 

A rainbow is seen over the Sydney Harbour Bridge on June 17, 2015 in Sydney, Australia