Why are the bubbles in bubble bath always white even when a different color bubble bath is used?
Bubbles are made of water and have air inside
Water has a higher refractive index than air (it slows down light more), and because they are spherical, they act like a divergent lens, bending the light.
As the light bounces through many bubble surfaces it is bent each time- it is scattered (reflected and refracted) in all directions (including back to your eyes).
All the wavelengths (which equate to colours) act in the same way- (hardly any of the light is absorbed as the coloured water-the bubble- is so thin)
Colours are seen when white light is shone through an object (in this case coloured bath water), where wavelengths of a particular length are absorbed and others are unaffected.
Refraction occurs when light goes through an object (a rainbow is made when light refracts through water and shows how white light is made up of all different colours)
Reflection occurs when light is bounced back off a surface
As all wavelengths act the same, if you shine light on the bubbles, the same proportions of wavelengths gets back to your eyes.
As you're using white light from a bulb or the sun (which is made up of all the colours with a wide range of wavelengths)- you'll see white bubbles.
(of course if you used a red light for example- you would see red bubbles)
If the coloured liquid was very thick or had a very intense colour, the bubbles would be lightly tinged as more of the corresponding wavelengths are absorbed- but still much lighter than the bulk fluid. (e.g. bubbles on the head of a Guinness are more creamy than white because of the dark brown liquid).
I hope that this has answered your question :)
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Soap bubbles have color because they reflect light in a weird way. The way the reflect color is based on the thickness of the bubble. Some of the light coming to the bubble reflects off of the inner surface of the bubble, and some off of the outer surface. The two waves of light cancel out or add in different ways, so different colors of light are produced. In a really thin bubble, no light…
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Is there any difference between the colours emerging from a prism and the colours of a soap film seen in sunlight?
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These all three color are best in different different manners. Its depend on our self how and where using these colors. As an example If we are looking the dress for wedding dress then red and purple are best color specially for the women clothing but for the causal dress blue is always the best color.