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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 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

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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 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 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 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 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

¡¤ The distance ¡°x¡±, between two laser points (the distance between n and n1) on the wall.

¡¤ In order to get a greater accuracy distance, it is suggested to take the twice distance, x, (which between points n and n) and then take the average to get n.

¡¤ Vary the slit separation, d, for both methods.

Slit to wall distance L.

Available formulae

dsin¦È=L¦Ë ¦Ë=(dsin¦È)/L x/L=tan¦È ¦È=tan-1 (x/L)

Diagrams

¡¤ Helium-neon laser

¦È

L

n x n1

Diffraction grading

Narrow slit

W Wide slit

Collected data

L=.87m L=.87m L=6.m L=4.47m

d=0.0005m x=0.0017m x=0.008m

d=0.000m x=0.001m x=0.001m

D=1/100000m x=0.5m x=0.46

D=/100000m x=1.0m x=1.47

D=6/100000m x=.4m x=.18

Data with uncertainty values

L=.85+0.05m L=.80+0.05m L=6.0=0.05m L=4.45=0.05m

d=0.0005m x=0.0017+0.0001m x=0.008+0.0001m

d=0.000m x=0.001+0.0001m x=0.001+0.0001m

d=1/100000m x=0.5+0.01m x=0.46+0.01m

d=/100000m x=1.0+0.01m x=1.47+0.01m

d=6/100000m x=.4+0.01m x=.18+0.01m

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