optics.gif (6954 bytes)

TRANSMISSION OF LASER LIGHT THROUGH SLITS AND GRATINGS
(Interference and Diffraction)








EQUIPMENT
    redball.gif (326 bytes) Laser
    redball.gif (326 bytes) Slits and Gratings
    redball.gif (326 bytes) Variable Width Slit
   


NARRATIVE
            This demonstration is used to show Fraunhofer Diffraction Young's experiment and interference through gratings. A Laser is used as a light source. Caution! Do not shine the laser beam on the class. For single slit diffraction, insert the variable width slit in the beam. Close the slit until diffraction is apparent. For Fraunhofer Diffraction over an edge, open the slit and use one side of it. For Young's experiment, place the double slit in the beam. Interference can also be demonstrated by placing a transmission diffraction grating in the beam.