An Investigation of Modern Physics by Brian Williams
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  • Colour – Williams’ Taper Slit Experiment

    Posted on November 8th, 2009 Brian No comments

    To demonstrate that Green and Magenta are not ‘Primary’ colours, the following simple experiments are presented. For the 1st experiment, we have a tapered slit in place of the normal parallel slit.

    A Tapered Slit.

    If you view this slit through a prism you will see a spectrum as shown below: –

    Viewing the tapered slit through a prism.

    • As the Yellow and Cyan (Bright Blue) bands overlap the result is Bright Green.
    • As the Red and Blue bands overlap the result is Purple.
    • As the Yellow and Blue bands overlap the result is a Mid Green.
    • As the Cyan and Red bands overlap the result is Mauve (Light Purple).

    These are exactly the same as the artist’s mixing rules.

    The physicist’s distorted ‘Standard’ spectrum forces them to argue that a completely different set of physics laws must apply to light.


    1. At the thin end of the slit the amount of light passing through is drastically reduced and makes it difficult to accurately determine the colours.
    2. The Cyan band is caused by the interference effect between White and ‘true’ Blue.

    You will notice that there is no Magenta involved. Magenta requires a certain amount of compression to create the additional energy and should not be confused with the Mauves and Purples.

    The Slit and Taper Slit spectra are what I  call ‘Expansion Spectra’.


    Short extract from Physics or Fantasy – Section 2 – Colour and the Quantum Theory.


    One response to “Colour – Williams’ Taper Slit Experiment”

    1. Aubrey Depolis

      Hello, your blog is fantastic. Thank you, very much.

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