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ARUN DASH Grade: Upto college level
        

IN A YOUNG DOULBLE SLIT EXPERIMENT THE INTENSITY AT CENTRAL MAXIMUM IS I. THE INTENSITY AT A DISTANCE B/4 AT CENTRAL MAXIMUM IS ( B IS THE FRINGE WIDTH)

7 years ago

Answers : (1)

Askiitians Expert Soumyajit IIT-Kharagpur
28 Points
										

Dear Arun Dash,


Ans: B=λD/d................(1)


Now at a distance B/4 from the central maxima the angle made by the light ray is θ, then


tanθ=B/4D≈θ≈sinθ (as θ is very small).......................(2)


Now path difference is d sinθ=d B/4D and hence phase difference is (2∏/λ)d (λD/d)/4D=∏/2


Now intensity at this point is=Icos²(∏/2)=I/2


 


 


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Regards,


Askiitians Experts
Soumyajit Das IIT Kharagpur

7 years ago
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