Light with a wavelength of 580 nm passes through two fans, creating an interference pattern on the screen located 3.2 m away. The first luminous eave is formed at a distance of 4.92 mm from the center of the central luminous canopy. What wavelength light should be used to observe the first dark fringe where the first luminous fringe is formed?

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Light with a wavelength of 580 nm passes through two fans, creating an interference pattern on the screen located 3.2 m away. The first luminous eave is formed at a distance of 4.92 mm from the center of the central luminous canopy. What wavelength light should be used to observe the first dark fringe where the first luminous fringe is formed?
 
 
 
 
 
 
 
 
 
 
 
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