In double slit experiment, the angular width of the fringes is 0.20o for the sodium light (λ = 5890 Å). In order to increase the angular width of the fringes by 10%, the necessary change in the wavelength is
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a
Increase of 589Å
b
Decrease of 589Å
c
Increase of 6479Å
d
Zero
answer is A.
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Detailed Solution
θ=λd; θ can be increased by increasing λ, so here λ has to be increased by 10% i.e., Increase in λ =10100×5890=589 A0