In a school laboratory, a group of pupils is measuring the length of the pocket of light emitted by a solid-state laser with the apparatus schematized in the figure, consisting of a diffraction grating of 800 slits/mm and a screen covered with graph paper. The distance between the reticle and the screen is 23.5 cm and that between the central maximum M0 and the first bright fringe M1 is 14.5 cm. Use the data shown in the figure and calculate ?. [RESULT: [6,56 10^?7m]

14,5 cm IM, schermo 23,5 cm reticolo titt laser