Microwaves transmitted through a double slit. On a diagram it shows the central maximum in the centre of a semicircular arc surrounding the slits and right above the line of transmission of the microwaves (point O) and the next maximum a little further right along the semicircle at point X.
The slits are 24mm each and the distance separating them is 6.6cm. The vertical distance between points X and O is 8.1 cm.
How would the wavelength of these microwaves be calculated?