• Question: how do you know that the sky is green and we are just colourblind

    Asked by YEET to Sophie, Simon, Obi, John, Jessica on 9 Nov 2018.
    • Photo: John Midgley

      John Midgley answered on 9 Nov 2018:

      We can study the wavelength of the light. Every colour has a specific wavelength.

      We see the sky as blue because it is a short wavelength and is easily scattered by the dust in the air.

      If you are colourblind, and see blue as a different colour (this happens inside your head) it will still seem normal to you.

      Eye tests will prove if you are colourblind, I have had mine tested and am not colourblind, so confident what I see as blue is really blue.

      But, if I eat a banana, does everyone taste the same taste that I do when they eat a banana?


    • Photo: Sophie Morse

      Sophie Morse answered on 15 Nov 2018:

      Light hits things and whatever colour it reflects, it gets sent back to our eyes. That’s the colour that we see.