Why do we see a spectrum after Swimming?

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SUMMARY

After swimming, individuals often observe a spectrum around light sources due to the refraction of light through excess water on the surface of the eye. This phenomenon occurs because the water, influenced by surface tension and gravity, forms a non-spherical shape that acts as a prism, bending different wavelengths of light at varying angles. Additionally, chlorine and other chemicals in pool water may contribute to temporary fogging of the cornea, further affecting light perception. Conducting experiments, such as observing light while holding the head vertically downwards, can provide further insights into this optical effect.

PREREQUISITES
  • Understanding of light refraction principles
  • Basic knowledge of human eye anatomy
  • Familiarity with the effects of chemicals like chlorine on the eye
  • Concept of surface tension in fluids
NEXT STEPS
  • Research the physics of light refraction in different mediums
  • Explore the anatomy and function of the human cornea
  • Investigate the effects of chlorine and other pool chemicals on eye health
  • Conduct experiments on light perception under varying conditions
USEFUL FOR

Individuals interested in optics, swimmers concerned about eye health, and anyone curious about the interaction between light and water in relation to human vision.

anuragkanase
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Hey guys,
I recently noticed that, after a swim, when you look at the light, you see a spectrum around it. The light was white light. And you see it with naked eyes.
Can you guys explain this phenomenon?
The water did contain Chlorine and maybe other necessary chemicals required in swimming pool.
Thank you.
 
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I am not a biologist or a medic but I do know that after I swam my eyes watered more.

The excess water on the surface of my eye is affected by surface tension and gravity so it must be pulled into a non spherical curve which hence is a prism and will refract light of different wavelengths at different angle so producing a spectrum.

Do what all good physicists do and I am going to do next time I swim - do an experiment.

If I hold my head as close as possible to vertically downwards and look at a light source directly beneath I would expect the spectrum to disappear


Regards

Sam
 
You're right. I need to experiment it different ways. But it must happen when we cry. Oh, I am not certain but your answer is somewhat correctly related to sphere formed by tear drop. And I think yes we see a spectrum when we cry.
Holy, I can't even cry right now.
Thanks for the answer.
 
My guess that the cornea is absorbing some of the chlorine or other chemicals from the water, (chemicals tend to transfer from higher concentrated fluids to lower concentrated fluids), resulting in a slight fogging of the cornea. Once you're out of the pool, eventually the chlorine or other chemicals will get dispersed by the fluids produced at your eyes.
 

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