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Textbook Expert
Textbook ExpertVerified Tutor
17 Nov 2021

Given information

Given Data :
 
The wavelength of the light passes through two slits :
 
 
 
 
 
Distance between the slits        
 
The order of the interference   
 
Distance from the slit to the screen    
 
Separation of the two fringes on the screen       

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.
 
 
Consider the figure to find the angle between the fringes   as shown below :
 
Here 
 
  is the distance from the slit to the screen
 
  is the distance between the fringes on the screen
 
 

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