Unit – K3 Refraction + Colour 6th June 2007 Form Group 8_y.

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Presentation transcript:

Unit – K3 Refraction + Colour 6th June 2007 Form Group 8_y

Colours of the spectrum

A prism splits a ray of white light into a spectrum of colours. This is known as dispersion. When white light is split, the colours always follow the same order. Use this phrase to remember the order of colours: Splitting white light into colours Richard Of York Gave Battle In Vain

A coloured filter changes white light by only allowing part of the spectrum through it. What colour do you think we will see if we put a red filter in front of the light source? Why?

Therefore what colour would the light be if we had a green filter?

What we have learned: If a red filter is present, red light is seen and if a green light is present then green light is seen!! So….what happens when if we have a red filter first giving red light and then a green filter? What colour light will you see?

Three primary colours in science are

red blue green yellow cyan magenta What can you see when all the primary colours are together?

What will happen if we mix all of the secondary colours together, i.e magenta, yellow and cyan? We get BLACK!!!

The colour of an object is the colour of light that it reflects. There are two exceptions….. White objects reflect all colours and absorbs none Black objects reflects no colours and absorbs all

Object in white light Object in red light Object in green light Object in blue light You will need the 3 coloured filters (green, blue, red)

Seeing red

Seeing green

Seeing black

SCIENCE EXAMPLE...