Year 8 science, colour of light lesson,

6. Primary Colours You can make any colour by mixing three colours. Do you know what they are? Red Green Blue The colours labelled in black text are the PRIMARY COLOURS. The colours labelled in blue text are called SECONDARY COLOURS. They can be made by mixing the primary colours Cyan Yellow Magenta

7. Primary Colours PRIMARY COLOURS are RED, GREEN and BLUE SECONDARY COLOURS are YELLOW, CYAN and MAGENTA W

8. Red objects Why does a red snooker ball look red in white light? Remember white light is made of a spectrum of colours. The snooker ball absorbs all the colours of the spectrum EXCEPT red, red light is reflected into our eye. The snooker ball appears red.

9. Black objects Why does a black snooker ball look black in white light? The snooker ball absorbs all the colours of the spectrum. NO light is reflected into our eye. The snooker ball appears black.

10. White objects Why does a white snooker ball look white in white light? The snooker ball doesn’t absorb any of the colours of the spectrum. The whole spectrum of light is reflected into our eye. The snooker ball appears white.

11. Red, blue and green filters Red filters absorb all colours…. Blue filters absorb all colours…. Green filters absorb all colours…. … apart from red light … apart from blue light … apart from green light

12. PRISMS Dispersion of white light

13. PRISMS Single coloured light (Red)

14. PRISMS Single coloured light (Blue)

15. COLOURED OBJECTS White object in white light  All colours reflected White objects reflect all colours and absorb none Object appears white

16. COLOURED OBJECTS White object in blue light  Blue light reflected White objects reflect all colours and absorb none Object appears blue

17. OBJECTS IN COLOURED LIGHT White object in red light  Red light is reflected White objects reflect all colours and absorb none Object appears Red

18. OBJECTS IN COLOURED LIGHT Red object in red light  Red is reflected Red Objects reflect red light Object appears Red

19. OBJECTS IN COLOURED LIGHT Red object in blue light  No light is reflected Red Objects reflect red light and absorb all others Object appears black

20. A red apple A green pear A white plate THE FRUIT BOWL IN WHITE LIGHT

21. A red apple A green pear A white plate THE FRUIT BOWL IN RED LIGHT

22. A red apple A green pear A white plate THE FRUIT BOWL IN BLUE LIGHT

23. FILTERS white light – red filter

24. FILTERS white light – blue filter

25. FILTERS blue light – blue filter

26. FILTERS blue light – red filter

27. FILTERS white light – red and blue filter

33. TESTING COLOUR BLINDNESS. WHAT DO YOU SEE?

34. TESTING COLOUR BLINDNESS. WHAT DO YOU SEE?

35. TESTING COLOUR BLINDNESS. WHAT DO YOU SEE?

37. TESTING COLOUR BLINDNESS. WHAT DO YOU SEE?

38. TESTING COLOUR BLINDNESS. WHAT DO YOU SEE?

39. TESTING COLOUR BLINDNESS. WHAT DO YOU SEE?

40. TESTING COLOUR BLINDNESS. WHAT DO YOU SEE?