Suppose light with wavelength 540 nm has parallel wavefronts incident on two slits that are both 0.36 mm wide, and separated by 0.5 mm. A screen is placed 1.2 m from the slit. The intensity at the optical axis is 5 mW. What is the distance from the optical axis to the second minimum on the screen in mm?

Suppose light with wavelength 540 nm has parallel wavefronts incident on two slits that are both 0.36 mm wide, and separated by 0.5 mm. A screen is placed 1.2 m from the slit. The intensity at the optical axis is 5 mW. What is the distance from the optical axis to the second minimum on the screen in mm?