Colour

Colour

1. Spectrum

   • Colours
     • Red
     • Orange
     • Yellow
     • Green
     • Blue
     • Indigo
     • Violet
     • Richard Of York Gave Battle In Vain

2. Colour Mixing

   • Blue and Red = Magenta
   • Red and Green = Yellow
   • Green and Blue = Cyan
   • Cyan and Magenta = White
   • Magenta and Yellow = White
   • Yellow and Cyan = White
   • Cyan and Blue = Cyan
   • Red and Magenta = Magenta
   • Yellow and Green = Yellow
   • Red and Yellow = Yellow
   • Blue and Magenta = Magenta
   • Green and Cyan = Cyan

3. White Light is NOT just a single colour

   • Made of a mixture of colours (Spectrum)

4. Filters

   • Filters only let one colour of light go through it.
     • All other colours absorbed (Don't go through)
   • A Red filter absorbs all colours (Orange, Yellow, Green etc.) apart from Red.
   • A Blue filter followed by a Red filter will not show any light.
     • This is bacause, the Blue filter only absorbs Blue and then there is no Red in Blue for the Red filter to let through.
   • A Magenta filter followed by a Red filter will show red light.
     • This is because, the Magenta filter shows Red and Blue light and then the Red filter absorbs the Blue but lets through the Red.

5. Coloured Objects

   • Coloured objects REFLECT that colour.
   • Blue jeans are Blue because they reflect Blue light and asorb all the other colours.
   • Black and White
     • Black objects ABSORB all colours
     • White objects REFLECT all colours

6. Objects that seem to change colour in coloured light

   • A Red boot with Green laces looks Red with Green in White light.
     • The Red absorbs every colour APART from Red
     • The Green absorbs every colour APART from Green
   • A Red boot with Green laces looks Red with Black in Red light
     • The Red boot absorbs all the colours APART from Red.
     • The laces look Black as in Red light there is no Green. The laces however absorb all of the colour leaving it looking Black.
   • A Red boot with Green laces looks Black with Green in Green light.
     • The boot looks Black as in Green light there is no Red to reflect.
     • The laces look Green as they reflect the Green light.