It is probably the effect of the bubble breaking up the rays of white light in a similar way that a prism does.
A soap film is so thin that the wavelength of visible light is comparable and this causes iridescence -- light is reflected from both the inner and outer surface of the film . But it is not perfectly uniform, and at any time, consists of an ever changing thickness as wind currents and gravity disturb the molecules. Each thickness refracts light differently, sending various wavelengths into your eye, while others head off into a different direction, so your viewing angle is what affects the colour you see from any particular place in the bubble. The light before it is refracted is 'white light' -- that is, consists of all visible colours (and more), and the light that leaves does so spread out spatially. For this reason, from any particular viewing angle, you see several colours, and these move about as the thickness is not constant in time.
Because its film is thinner at some places than at others, and different thicknesses reflect different colours. The black parts are the thinnest, and reflect no light at all. They have been found to be only one three-millionth part of an inch thick.
by Chasuk 13 years ago
I'm going to describe something that maybe happened, or maybe it didn't. I'm skeptical of human experience, even my own.When I say "happened," I don't mean it in the sense of a single occurrence. This is something that used to be part of my daily life, or maybe it wasn't. Remember my...
by Shwetha Shetty 13 years ago
What are the different colors of rainbow?
by Paul Deeds 17 years ago
I made a small change to the hub stats graphs a few minutes ago. You now get one graph that shows you the lifetime traffic for a hub with the top 3 referrers stacked in different colors. The graph no longer changes scope when you select different tabs (but I may bring that back...
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