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In double slit experiment, the angular width of the fringes is 0.20 o for the sodium light (  =5890 Å). In order to increase the angular width of the fringes by 10%, the necessary change in the wavelength is

1. Increase of 589 Å
2. Decrease of 589 Å
3. Increase of 6479 Å
4. Zero PG #2

Correct answer: Increase of 589 Å

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