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 PS-41 Main Page Map Exhibits Resources Feedback |
.jpg) Primary Science Learning Experience PS–41 Colours  TRY THIS View the scene outside via one of the fixed colour filters. Combine with other hand-held colour filters. Try different filter arrangements. What do you see through the different overlaps? What light comes through the central rectangular windows? WHAT IS HAPPENING Primary colours cannot be created by mixing other colours. The 3 primary colours are Red, Green and Blue (RGB). Looking through any primary colour filter, the scene outside appears in the same shade because no other colours can pass through the filter. Adding a different colour, hand-held filter reduces the light because the additional filter does not allow the colour light of the preceding filter to pass through it. The rectangular windows are transmission diffraction gratings which disperse or separate light into its component colours. The grating contains thousands of (vertical) thin lines in the thin transparent film. 
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