Does the incidence angle and refraction angle have to add up to 90

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SUMMARY

The incidence angle and refraction angle do not always add up to 90 degrees in thin film refraction scenarios. They only sum to 90 degrees when the angle of incidence equals the Brewster angle, resulting in fully polarized reflected light. This clarification emphasizes the importance of understanding Snell's Law, which governs the relationship between these angles under various conditions.

PREREQUISITES
  • Understanding of Snell's Law in optics
  • Familiarity with the concept of Brewster's angle
  • Basic knowledge of light polarization
  • Geometry of thin film interference
NEXT STEPS
  • Research the derivation and applications of Snell's Law
  • Study the properties and implications of Brewster's angle
  • Explore the principles of light polarization and its effects on reflection
  • Investigate thin film interference patterns and their geometric implications
USEFUL FOR

Students and professionals in physics, optical engineers, and anyone studying the behavior of light in thin films and polarization effects.

applestrudle
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does the incidence angle and refraction angle have to add up to 90

I'm trying to figure out the geometry of thin film refraction!
 
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Not in general. They don't have to.
They do add up to 90 degrees when the angle of incidence is the Brewster angle and the reflected light is fully polarized.
 
applestrudle said:
does the incidence angle and refraction angle have to add up to 90

I'm trying to figure out the geometry of thin film refraction!

Where did you read anything to that effect? Snells law doesn't lead to that general conclusion, does it? Are you referring to a certain, special situation?
 

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