Explain this light pattern

[pietpetoors]

Who are the scientists among us?
This weekend we dined at a restaurant. In the roof just behind me were green, blue and red downlights. (they are still there)

I noticed that when you move your hand the shadow is a colour.
How is it possible that a SHADOW can have a colour?

Colourful shadows

light.jpg (27.56 KiB) Viewed 1249 times

[Mud Dog]

As I understand it, red green and blue are the basic colours of the spectrum and most other colours can be achieved from some mix of them (the old CRT TV's had only three colour guns - red green and blue).

Combined they give something close to normal light and depending on how far apart they are spaced, where one casts a shadow the other two fill in and create a colour - there should be three different shadows of differing colours.

That's just my take on it.

[CasKru]

Ek is met Andy op die een.

Met lig gee Blou, Rooi en Groen lig vir jou wit lig. Sonder jou skaduwee kry die hele tafel ewe veel lig van die drie bronne en laat dit wit lyk. Sit nou jou hand voor die groen lig dan daar waar jou skaduwee val maak hy 'n mengsel van die rooi en blou lig (behoort pers te wees - skaduwee regs bo in jou prentjie). As jy nou jou hand voor die rooi lig sit dan kry jy weer meer 'n blou-groen skaduwee (skaduwee in die middel) ens. In jou prentjie het jou meer as een bron van die verskillende kleure dis hoekom daar baie meer verskillende kleure "skaduwees" is

[pietpetoors]

Dankie Cassie, dit maak sin.

[Dowe Koos]

Soos ek al iewers voorheen gesê het, die Suid Afrikaaners is darem 'n slim nasie. Ek self dink ek is slim maar mens is nooit oud om te leer nie.