Light of wavelength 551 nm falls on a 0. 427-mm-wide slit and forms a diffraction pattern on a screen 1. 46 m away.
a. Find the angle theta for the direction at which the first dark band on either side of the central maximum occurs. rad ( ± 2E-5 rad)
b. Find the distance on the screen from the central maximum to the first dark band on either side of it.