Light incident on a pair of slits...?

Question

Light incident on a pair of slits produces an interference pattern on a screen 2.3 m from the slits. If the slit separation is 0.016 cm and the distance between the bright fringes in the pattern is 0.77 cm, what is the wavelength of the light?

Which equation do I use for this? Any help would be appreciated!! Thanks!

Answer 1

About 535.65 nm.
The small-angle approximation equation is
λ/d = y/D, or λ=dy/D
See the ref.