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20 Nov 2021

Given information

Given Data :
 
Distance between the two slits  
 
Distance between the  interference pattern observed on a screen     
 
Order of a first-order fringe  
 
The distance between the fringes on the screen  
 
The wavelength of the light and color  
 
 
 

Step-by-step explanation

Step 1.
To obtain constructive interference for a double-slit :
 
 
 
where 
 
  is the distance between the slits
 
 is the angle relative to the incident direction
 
and is the order of the interference.
 
 
 

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