. In double slit experiment, the angular width of the fringes
is 0.20° for the sodium light (l = 5890 Å). In order to increase the angular width of the fringes by 10%, the necessary change in the wavelength is
A. Increase of 589 Å
B. Decrease of 589 Å
C. Increase of 6479 Å
D. Zero
Best Answer
Ans: A
Sol: By using 
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