Dry vs. Humid Air: Refractive Index Differences

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SUMMARY

Humid air exhibits a distinct refractive index compared to dry air, specifically in the microwave region where the real part of the refractive index, n'(dry), is greater than n'(humid), and the imaginary part, n''(dry), is less than n''(humid). This indicates that humid air has different optical properties than dry air, affecting how light propagates through these mediums. The discussion emphasizes the qualitative differences in the refractive index on dry versus humid days, focusing on the implications of these differences rather than numerical solutions.

PREREQUISITES
  • Understanding of refractive index concepts
  • Familiarity with microwave region properties
  • Knowledge of complex refractive index (n' and n'')
  • Basic grasp of light propagation in different mediums
NEXT STEPS
  • Research the implications of complex refractive index in optics
  • Study the effects of humidity on light propagation
  • Explore microwave region characteristics and applications
  • Examine the relationship between refractive index and atmospheric conditions
USEFUL FOR

Students in physics or engineering, optical scientists, and anyone interested in the effects of humidity on light behavior in different environments.

Firben
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Homework Statement


This is from a old exam[/B]
Humid air has a different refractive index than dry air: in the microwave region n'(dry) > n'(humid) and n''(dry) < n''(humid), where n' and n'' denote the real and imaginary part of the refractive index, respectively. How are the effects asked for above different (qualitatively) on dry and humid days ?

Homework Equations



n =c/v

The Attempt at a Solution



What are they asking for ? It is how the < changes during dry/humid days ?
 
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It is asking for a qualitative answer. It is not asking for any solution to be worked out, but what does the real and imaginary parts mean. Hint: Read about the complex refractive index in the wikipedia article on refractive index.

Regards,
KQ6UP
 
Firben said:

Homework Statement


This is from a old exam[/B]
Humid air has a different refractive index than dry air: in the microwave region n'(dry) > n'(humid) and n''(dry) < n''(humid), where n' and n'' denote the real and imaginary part of the refractive index, respectively. How are the effects asked for above different (qualitatively) on dry and humid days?
What are they asking for ? It is how the < changes during dry/humid days ?
What ARE they asking for? The problem states "... the effects asked for above ..." so there must have been something "above"?
 

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