Maths

Physics

Light and colour

When white light is dispersed through a
prism it splits into all the colours of the
spectrum, showing that white light is
actually made up of all the different colours
(a similar thing happens when rainbows
are formed)
The primary colour in light are
Red,Blue and Green

Red,blue and green mixed produce white
Light
Blue and red mixed produce magenta
Blue and green mixed produce  cyan
Red and green mixed produce yellow
Cyan ,magenta and yellow are secondary
colours

When white light shines on a red object only red light is reflected
all the other colours are absorbed

Blue light light reflects form
blue objects, the others are absorbed

Both green and red light
(mixed to make yellow)
                   is reflected
                            from
                             yellow
objects, the others are absorbed

Colour filters work in a similar way

In a red filter only red light passes through
the other colours ate absorbed

Only green light passes through a green
filter, the others are absorbed

Green and blue light passes through a
cyan filter,the others are absorbed