Suppose you are doing a diffraction experiment using a white light source on a piece of grating in which the number of grooves is 10,000 lines per centimeter. After shining this light on the grating a first order diffraction of the shortest and longest wavelengths of light ( 380 nm and 760 nm ) is visible on a screen 2 m away from the grating. The distance between the ends of the rainbow produced on the screen is