Optical Effect: curved light source when seen through the bus window

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Discussion Overview

The discussion revolves around the optical effect observed when viewing street lights and vehicle headlights through a bus window at night, where the lights appear curved. Participants explore potential explanations for this phenomenon, including refraction, reflections, and camera artifacts.

Discussion Character

  • Exploratory, Debate/contested, Technical explanation

Main Points Raised

  • One participant suggests that the curvature of the light is due to refraction through the window.
  • Another participant asserts that the window is flat, challenging the refraction explanation.
  • A different viewpoint proposes that the observed effect may be reflections caused by streaks on the glass, possibly from oil or cleaning residue.
  • One participant questions the validity of the glass effect, suggesting it could be an artifact of the camera, noting the concentric nature of the streaks.
  • Another participant observes that there appear to be two foci of concentricity, speculating that the cause might be fingerprint smudges on the camera lens.

Areas of Agreement / Disagreement

Participants express differing opinions on the cause of the optical effect, with no consensus reached regarding whether it is due to refraction, reflections, or camera artifacts.

Contextual Notes

Some assumptions about the conditions of the observation, such as the state of the glass and the camera, remain unresolved. The discussion does not clarify the exact nature of the optical effect or the reliability of the images presented.

Marth
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During the night, I was traveling by local bus. And as I viewed through the window, the light from the street lights and the headlights of other vehicles appeared curved, as shown in the images below:
viber_image_2023-10-26_19-50-48-679.jpg
viber_image_2023-10-26_19-50-48-472.jpg

One common answer is: because of refraction
Is there any more explanation for this behavior?
 
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Welcome to PF.

Marth said:
Is there any more explanation for this behavior?

The window is curved...
 
No, it is not. That's a perfectly flat glass surface.
 
Pretty sure those are reflections off streaks on the glass - could be oil, could be residue from a cleaner.

These, but curved:
1698332183726.png
 
Upon further "reflection" I am not convinced this is an effect of the glass.
It's got to be an artifact of your camera.

The streaks are perfectly circular, perfectly concentric, and their origin is in the direction your camera is pointed.
1698332455113.png


Is it an uncropped image? I don't suppose you cropped off the left side of the image did you?
 
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In fact, there seem to be two foci of concentricity in discrete areas:

1698335425644.png

They could very well be fingerprint smudges on your lens.
 
Last edited:
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