In double slit experiment, the angular w...

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

increase of `589Å`

decrease of `589Å`

increase of `6479Å`

zero

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