johns thesis

: The aim of this experiment is to find out the wavelength l of the Helium-neon
(He-Ne) laser using double slits and different gratings.

Method: There¡¯re two methods be used to find the wavelength: with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters: Method: There¡¯re two methods be used to find the wavelength: with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters:
Method: There¡¯re two methods be...