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(Figure 1) shows the interference pattern obtained in a double-slit experiment with light of wavelength λ.


Constructive Interference 

(Figure 1) shows the interference pattern obtained in a double-slit experiment with light of wavelength λ.

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Part A 

Identify the fringe or fringes that result from the interference of two waves whose path difference differs by exactly 2λ.

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Answer #1

Answer- AD

A and D are 4 light bands apart.Each band is equal to ,

​​​​​​so total distance between them is equal to ​​​​​​

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