Size of a light beam before and after Refraction

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    Beam Light Refraction
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SUMMARY

The size of a light beam changes after refraction through a medium, despite the angle of deviation remaining constant. This phenomenon occurs due to the varying widths of the beam as it passes through different materials, which can be mathematically expressed but often leads to confusion. The discussion emphasizes the importance of understanding the geometric relationships involved in light behavior, particularly the angles and distances related to beam width and direction of travel.

PREREQUISITES
  • Understanding of Snell's Law and refraction principles
  • Familiarity with geometric optics and beam width concepts
  • Knowledge of light behavior in different media
  • Basic mathematical skills for analyzing angles and distances
NEXT STEPS
  • Research Snell's Law and its applications in optics
  • Explore geometric optics, focusing on beam propagation and width
  • Study the mathematical modeling of light refraction in various media
  • Examine practical examples of light behavior in prisms and lenses
USEFUL FOR

Students of physics, optical engineers, and anyone interested in the principles of light behavior and refraction in different materials.

csirvi
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The size of light beam is same or different before and after refraction from a medium. If same then why we can not prove from mathematical expression. If not same why?
 
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csirvi said:
Summary:: The size of light beam is same or different before and after refraction from a medium. If same then why we can not prove from mathematical expression. If not same why?

The size of light beam is same or different before and after refraction from a medium. If same then why we can not prove from mathematical expression. If not same why?
Doesn't look the same size to me...

https://cdn3.vectorstock.com/i/1000...rism-ray-rainbow-spectrum-vector-22696987.jpg

1590153600288.png
 
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Its helpful. . One more question is that if we take single color then the angle of deviation is same but also width of beam after refraction changes mathematically how that is physically possible ?
 
Can you post a picture or diagram of the situation you are asking about? Thanks. :smile:
 
Screenshot_20200522-214642.jpg
 
csirvi said:
then the angle of deviation is same but also width of beam after refraction changes mathematically
Does it? The width of the beam is the distance along a perpendicular to the direction of travel. Look carefully at the angles that you're taking the cosine of... are these what you want?
 
Nugatory said:
Does it? The width of the beam is the distance along a perpendicular to the direction of travel. Look carefully at the angles that you're taking the cosine of... are these what you want?
See width represent soze of beam yes that perpendicular to the Direction of travel.
My question is when the deviation angle same why the width is variable
 
berkeman said:
Can you post a picture or diagram of the situation you are asking about? Thanks. :smile:
Posted the image.
 
berkeman said:
Can you post a picture or diagram of the situation you are asking about? Thanks. :smile:
Screenshot_20200522-214642.jpg
 

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