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Textbook Expert
Textbook ExpertVerified Tutor
19 Nov 2021

Given information

Given Data :
 
Distance between the slits   
 
Distance from the slit to the screen  
 
The wavelength of the light  
 
 
From the given figure, we have
 
 
There are a total of   fringes and 
 
It gives the distance between the 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.
 
 
 
  

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