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tech / sci.math / Re: Twin paradox article in Wikipedia

SubjectAuthor
o Re: Twin paradox article in WikipediaHonorio Christakos

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Re: Twin paradox article in Wikipedia

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https://www.novabbs.com/tech/article-flat.php?id=141293&group=sci.math#141293

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From: ios...@asrsosch.rc (Honorio Christakos)
Newsgroups: sci.physics.relativity,sci.physics,sci.math
Subject: Re: Twin paradox article in Wikipedia
Date: Wed, 19 Jul 2023 08:46:17 -0000 (UTC)
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 by: Honorio Christakos - Wed, 19 Jul 2023 08:46 UTC

Tom Roberts wrote:

> Note that our eyes perceive colors based on the energy of the photons.
> In water they travel more slowly than in air, but their energy does not
> change -- when modeled as a wave, in optical media with different
> indices of refraction, light's wavelength and speed change, but its
> frequency is unchanged. We KNOW this: when swimming under water, red
> items are perceived as red; if wavelength governed the color, we would
> perceive items that are red in air as cyan or blue under water.
>
> Think about how the eye's vitreous humor affects this.
> Hint: it doesn't.
>
> Unlike our color perception, the angle of deflection from a diffraction
> grating depends on the wavelength of the light, and thus is different in
> air and water.

since you assume a water which is not milky and no turbulence. But it's
strange that the water isn't changing chroma of the light. Atmospheric air
does.

For the example of the Sun at zenith, in broad daylight, the sky is blue
due to Rayleigh scattering, which also involves the diatomic gases N2 and
O2. Near sunset and especially during twilight, absorption by ozone (O3)
significantly contributes to maintaining blue color in the evening sky.

https://en.wikipedia.org/wiki/File:Rayleigh_sunlight_scattering.png

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