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) 

(1) sin1(0.33×108)

(2) sin1(0.33×106)

(3) sin1(3×108)

(4) sin1(3×106)

(4) Using relation, dsinθ=nλsinθ=nλd

For n = 3, sinθ=3λd=3×589×1090.589

= 3 × 10–6 or θ=sin1(3×106)

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