I need some help with these questions

6. A wave of light with wavelength 340 nm is sent through a diffraction grating with slits 500 mm apart. An image of the pattern is left on a screen that is 1.2 meters away. What would be the approximate order of the bright band that would result in a distance from one bright band to another being 3.26 x 106 m? 3. 40 x 10 = 300 / 3 7 ( x 10 6 ) 1500 ( 3 7 X 10-6 ) n in . 5 00 ( 3 7 + 10 6 ) 0.060 0. 256 (7. A wave of light with a wavelength of 600 nm goes through a 0, 3 mm wide double slit diffraction grating and has a bright band distance of 0,56 cm, OUS6 from the central bright band to the first order bright band. What is the distance from the slits to where the bright bands are being displayed? 6003 ( O056)