[csboyhk]

What is the relative error in concentration from UV-Visible spectroscropic analysis of a solution of 1.2 x 10-5 M with minor absorptivity equals to 2.0 x 104 cm-1 M-1 held in a 1.00 cm cell, if there is 1.0% stray radiation exist.

A = abc
   = 2.0 x 104 x 1 x 1.2 x 10-5 = 0.24

A = -log (I/Io) = 0.24

I don't know what is the use of 1%??

Thank you!

[Arkcon]

So, what is stray radiation?  Where does it go?  It all depends on the textbook definition.