# Colours

## •    Primary colours are those colours by mixing which white light is obtained but they themselves cannot be obtained by mixing any other colour of white light. •    Red, Green and blue are primary colours. •    They combine to form white light.•    Red + Blue + Green = White •    Secondary colours are those colours which are obtained by mixing any of the two primary colours. •    Yellow, cyan (or peacock blue) and magenta (or purple) are the secondary colours. Red + Green = Yellow Green + Blue = Cyan (or peacock blue) Blue + Red = Magenta (or purple) •    When white light falls on an opaque object, light of some colours is reflected by it and the light of rest of the colours is absorbed. •    The colour of an opaque object is the colour of light which it reflects. •    A white opaque object reflects the light of all colours while a black opaque object absorbs the light of all colours and reflects none. •    A transparent object passes the light of some colour and absorbs the light of rest of the colours.. The colour of a transparent object is the colour of light which it passes.

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• Q1

To form different colours like brown, peach, purple etc., colours needed are

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red, green and blue

##### Explanation:

Mixing of primary colours give other colours.

• Q2

If red, green and blue are mixed together, color formed is

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white

##### Explanation:

Red, green and blue are primary colours. By mixing all these colours, whitecolour is formed.

• Q3

Mixing of red colour and blue colour, gives

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magenta

##### Explanation:

Red and blue are primary colours and mixing of these two gives the magenta color which is a secondary colour.

• Q4

Overlapping of two primary colour forms a

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secondary colour

##### Explanation:

Secondary colours are the colours which are formed due to the mixing of two or more primary colours.

• Q5

Primary colours are

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