Angles are measured in degrees.


TABLE2: Observed angle vs wavelength data
Gas discharge lamb name is Mercury
Grating spacing d = 1 / (600 lines/mm)

Color  Theta      Theta       Theta       Lambda    Lambda  % Error   
       [cw dir.]  [ccw dir.]  [avr.]      [calc.]   [lit.]  
------ ---------  ----------  -------     --------  ------- -------
Violet        12          12  
Blue          14          14
Green         17          19
Yellow        20          21
Red           21          23


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TABLE3: Observed angle vs wavelength data
Gas discharge lamb name is Helium
Grating spacing d = 1 / (600 lines/mm)

Color  Theta      Theta       Theta      Lambda    Lambda  % Error   
       [cw dir.]  [ccw dir.]  [avr.]     [calc.]   [lit.]  
------ ---------  ----------  -------    --------  ------- -------
Violet        14          15   
Blue          15          16
Green         16          19
Yellow        19          22
Red           23          25