PURPOSE: To show the interfernce pattern from a grating.
DESCRIPTION: Three different courseness of grating are available.
Course Grating 1 has 150 slits of .06mm width and .025mm separation
Coarse Grating 2 has 150 slits of .03mm width and .125mm separation
Course Grating 3 has 300 slits of .03mm width and .125mm separation.
EQUIPMENT: Laser, gratings in holder, optical rail, glass screen, video camera.
Updated by Jun Qi in 3/22/2000