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Urgent - Malus Law - Graph Question

  1. Mar 12, 2008 #1
    1. The problem statement, all variables and given/known data

    ok, so i am writing my lab report which is due in tomorrow and the theory says that the graph of relative irradiance versus cos[tex]^{2}[/tex]θ should be linear, the lab script has told me that i should expect the plot to deviated from the expected linear shape, so i have this curved graph infront of me and i dont know what to say about it- i cant say that yes it is linear when a best fit line does not lye within the error bars - does anyone know what is the reason for the curve and what shall i say in the conclusion and interpretion of the write up?
     
  2. jcsd
  3. Mar 13, 2008 #2
    please help me!!!
     
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