In double slit experiment, the angular width of the fringes is \( 0.20^{\circ} \) for the sodium...

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In double slit experiment, the angular width of the fringes is \( 0.20^{\circ} \) for the sodium light \( (\lambda=5890 \AA) \). In order to increase the angular width of the fringes by \( 10 \% \), the necessary change in the wavelength is
(A) Increase of \( 589 \AA \)
(B) Increase of \( 6479 \AA \)
(C) Decrease of \( 589 \AA \)
(D) Zero
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