Suppose we change the slit separation to a value other than 8.5 10-5 m, with the

Question:

Suppose we change the slit separation to a value other than 8.5 × 10-5 m, with the result that the linear distance to the tenth bright fringe above the central bright fringe increases from 12 cm to 18 cm. The screen is still 2.3 m from the slits, and the wavelength of the light is 440 nm
(a) Did we increase or decrease the slit separation? Explain.
(b) Find the new slit separation.