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How are colours produced?

A prism splits light into the spectrum colours.Sunlight—bright white light—is a mixture of all the colours of the rainbow. This is called the spectrum of light. The different colours can be seen when a beam is shone through a shaped piece of glass called a prism. The prism bends the light waves. Red waves bend the least, while violet waves bend the most. Raindrops sometimes act as mini-prisms. They split light into the colours of the spectrum. We see them as a rainbow.



A rainbow is produced when millions of raindrops split sunlight into the different colours of the spectrum. These are: red,...Read More >>A rainbow is produced when millions of raindrops split sunlight into the different colours of the spectrum. These are: red, orange, yellow, green, blue, indigo and violet.

 
 

Grass and flowers reflect different colours of light. Grass, for example, reflects mostly green light, while these poppies...Read More >>Grass and flowers reflect different colours of light. Grass, for example, reflects mostly green light, while these poppies reflect mostly red light.

Seeing colours

We see colours because some objects reflect different colours of light. Some reflect mostly one colour. Grass, for example, reflects mostly green light, so it appears green. Others reflect a mixture of colours. 

Why is the sky blue? Sunlight is made up of different colours. Red light passes straight through the air, but blue light is scattered in all directions by the tiny molecules of air in the Earth's atmosphere. It is this blue light that we see when we look up at the sky.

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