In a double-slit experiment,the angular width of the fringes is $0.20^o$ for sodium light $(\lambda = 5890 \ \mathring{A})$. In order to increase the angular width of the fringes by $10\%$,the necessary change in the wavelength is:
- AIncrease of $589 \ \mathring{A}$
- BDecrease of $589 \ \mathring{A}$
- CIncrease of $6479 \ \mathring{A}$
- DZero
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