First slide
Coherent sources and their importance in interference
Question

In the Young’s double slit experiment with sodium light. The slits are 0.589 m a part. The angular separation of the third maximum from  the central maximum will be (given λ = 589 mm)   

Easy
Solution

 Using relation, dsinθ=sinθ=d  For n=3,sinθ=3λd=3×589×1090.589 =3×106 or θ=sin13×106

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