Mysterious Street Lamp Phenomenon Revealed

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SUMMARY

The discussion centers on the phenomenon observed around a street lamp, where a spherical halo appears around the light source, resembling a soap bubble. The lamp measures approximately 10 cm x 10 cm, and the halo has a radius of about 1 foot when viewed from 5 meters away. Participants concluded that the halo effect is primarily due to the reflection and refraction of light by water particles in the air, with its apparent size increasing as the observer moves further away from the lamp. This optical effect is likened to a small sundog, illustrating the interaction between light and atmospheric conditions.

PREREQUISITES
  • Understanding of basic optics, including reflection and refraction
  • Familiarity with atmospheric science, particularly the role of water particles
  • Knowledge of visual perception and how the human eye processes light
  • Basic measurement techniques for observing physical phenomena
NEXT STEPS
  • Research the principles of light reflection and refraction in different mediums
  • Explore atmospheric optics, focusing on phenomena like halos and sundogs
  • Study the human eye's response to light and visual perception mechanisms
  • Investigate the impact of environmental factors on light visibility and clarity
USEFUL FOR

This discussion is beneficial for physics enthusiasts, atmospheric scientists, and anyone interested in optical phenomena and visual perception. It provides insights into how environmental conditions affect the way we perceive light sources.

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i was walking along somewhere and i see this street lamp.

...

lol anyway so this street lamp is like ish bright, like you can look straight at it w/o hurting your eyes but its still bright. and i noticed that when you look at it, there's this like spherical shell around it, (when its dark outside). and that the shell is smaller if ur close and bigger when ur far away. it looks sortof like a soap bubble. in the spirit of scientific discovery i observed it very closely, and here are my measuremeants: lamp is about 10 cm x 10 cm, halo about 1 foot in radius when standing like 5 meters away. and the shell looks perfectly spherical. if you go like 1 meter farther the shell is noticeably bigger. I am really not sure why you see this funny shell/halo/something. I am guessing it has something to do with your eyes.

any thoughts?
 
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T@P said:
so this street lamp is like ish bright, like you can look straight at it w/o hurting your eyes but its still bright. and i noticed that when you look at it, there's this like spherical shell around it, (when its dark outside). and that the shell is smaller if ur close and bigger when ur far away. it looks sortof like a soap bubble. in the spirit of scientific discovery i observed it very closely, and here are my measuremeants: lamp is about 10 cm x 10 cm, halo about 1 foot in radius when standing like 5 meters away. and the shell looks perfectly spherical. if you go like 1 meter farther the shell is noticeably bigger. I am really not sure why you see this funny shell/halo/something. I am guessing it has something to do with your eyes.

any thoughts?
There can be some fuzziness associated with impaired eyesight, so that might have something to do with it. Most likely, though, it's entirely resultant of particles (mostly water) in the air reflecting and to some extent refracting the light. The apparent size varies with distance because a higher percentage of the light is directed away from you as you get closer. Think of it as a little-bitty sundog.
 

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