Hello,

I am having trouble understanding error in transmittance. Here is problem I am having trouble with:

A certain type of spectrophotometer exhibits one type of error which is constant with transmittance and which amounts to 0.25%T and a second type which is proportional to transmittance (relative error in T is constant) which amounts to 0.20%.

(a) At what value of transmittance will the relative error in concentration be a minimum? (Ans: 0.341)

(b) What is the realtive error in concentration at this point? (Ans: 0.71%)

(c) Between what values of T will the relative error in concentration be equal to or less than 1.0% (Ans. 0.18-0.647)

I know there are equations to use for this but I don't have a reference book that has these equations. I am also not really clear on the difference between the two types of error. ::)Any clarification would be very much appreciated. Thank you!