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Interference Patterns for Red and Blue Light
The diagrams below represent the patterns observed in experiments like Young's double slit experiment.  
   
We imagine that the experiment is performed first with a red filter on the light source, then with a blue filter.  
We expect the patterns to differ because red and blue light have different wavelengths.
Diagrams not to scale (although the last one is about what you see when all works well...)  
   
Red light interference pattern (λ = about 650nm)  
 
   
Blue light interference pattern (λ = about 450nm)  
 
   
The fringe spacing is smaller for blue light than for red, as expected.  
 
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