A double slit arrangement produces interference fringes for sodium light $(\lambda =589\mathrm{nm})$ that have an angular separation of $3.50\times {10}^{-3}\text{ radian. }$ For what wavelength would the angular separation be 10% greater?

• A

  527 nm

• B

  648 nm

• C

  722 nm

• D

  449 nm