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Spectra connected to a bright rectangular form
The three photos on the right show colored border spectra that arise when you look at a bright rectangular form on a dark background through a prism. This has already been described in principle on the page
border spectra. The colored spectra extend into the bright rectangular form from the upper border in red/yellow and from the lower border in blue/turquoise. They appear within the rectangular form and thus are related to the form.

If the height of the rectangular form is gradually reduced, from 8mm (Fig. 1) to 4mm (Fig. 2) and further to 2mm (Fig. 3), the two border spectra at the top and bottom move closer and closer together until they form a common spectrum (Fig3). In addition to the colours of the upper border spectrum (red/yellow) and the lower border spectrum (blue/turquoise), the colours green and orange appear in the middle of this common spectrum. It contains all the colors of a rainbow: blue, turquoise, green, yellow, orange and red. It arises from the two border spectra, when they come close together
under certain geometric conditions.

 

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Fig. 4  Enlargement of the bottom part of Fig. 3 
This spectrum contains the rainbow-colours: blue, turquoise, green, orange and red.

Spectra connected to a darkt rectangular form
The four photos on the right show colored border spectra that arise when you look at a dark rectangular form on a white background through a prism. The colored spectra extend from the top border of the form in blue/red and from the bottom border in red/yellow into the white space, which surrounds the dark form. Because they appear outside the dark form they are related to the space around the form.
 
If the height of the rectangular shape is now gradually reduced, from 8mm (Fig. 5) to 4mm (Fig. 6) and further to 3mm (Fig. 7) and 1mm (Fig. 8), the two spectra above and below move closer together, until they form a common spectrum. In addition to the colours of the upper border spectrum (blue/turquoise) and the lower border spectrum (red/yellow), the common spectrum includes the colour purple (magenta), which appears in the middle: yellow, red, purple (magenta), blue and turquoise. This common spectrum contains colours like in the rainbow spectrum, but they appear in reverse order and with less intensity. The color green from the rainbow-spectrum is missing, and the colour purple (magenta), which does not appear in the rainbow spectrum, appears here. This spectrum appears when the upper and the lower border spectra come close together under certain geometric conditions.

 

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Fig. 9   Enlargement of the bottom part of Fig. 8 
This spectrum contains the colours: yellow, red, purple (magenta), blue and turquoise.

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Fig. 1

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Fig. 5

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Fig. 2

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Fig. 6

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Fig.3

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Fig. 7

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Fig. 8