In double slit experiment with sodium light (\lambda=5890 Å), the angular width of interference fringes is 0.20^{\circ}. The change in wavelength required to increase the angular width by 10 \% will be

Correct Answer is : increase of 589Å

CGPET 2011 Solved Paper

Section: Physics

Question : 25 of 150

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In double slit experiment with sodium light (λ=5890Å), the angular width of interference fringes is 0.20∘. The change in wavelength required to increase the angular width by 10% will be

increase of 589Å
decrease of 589Å
increase of 6479Å
decrease of 6479Å

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