The region around a magnet where the magnetic force is exerted is known as its a. magnetic pole. b. lodestone. c. magnetic field. d. magnetic domain. select the best answer from the choices provided

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?