Calculate the error in measured absorbance of a 1.3 micrometer thick sample with n= 2.7 and...
Calculate the error in measured absorbance of a 1.3 micrometer thick sample with n= 2.7 and alpha= .2 per micronmeter, if the reflectance were neglected. Assume normal incidence.
Homework Answers
Let us assume that the light is travelling from air (n1 = 1 to the slab n2 = 2.7)
Reflectance coefficient for normal incidence R = ((n1-n2)/(n1+n2))2
R = (1.7/3.7)2 =0.459 = 0.46
As we know that Transmittance +Absorbance +Reflectance = 1
Absorbance = 1 - (Transmittance +Reflectance )
If reflectance is neglected, Absorbance = 1 - (Transmittance)
so error in absobance = Reflectance.
Please see the below image on how we calculate the
reflectance
Hence, error in absorbance = 0.54
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