ALL ABOUT COLOURS

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•       White is a mixture of all colours or mixture of primary colours.  White surface reflects away all the light.  

•      Black is the absence of light.  Black surface absorbs all the light.

•      Red, green and blue are said to be the primary colours.  All other millions of colours can be got by adding them properly.

•    Leaf looks green because it absorbs all the colours from sunlight except green which is reflected away by it.  

•      When red object is viewed using green light, it will look black, because even that green light is absorbed by the red object and no light is emitted.

•     If an element (sodium, carbon) is burnt, it will emit certain colours of light(spectrum).  It is like signature of the element.  Element can be identified using that colours. 

•      Only red laser and blue laser have been invented so for.  White laser is not possible, why?

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•   There is no blue sky.  Sun's blue light is scattered by the atmosphere and we perceive it as a blue sky.

•      Rainbow indicates colours emitted by the source of light , the sun.