I'd like to welcome you,
maadijk:, the the Chemical Forums but I'd like to ask you to read the
Forum Rules{click}. We like to help you learn to help yourself. Can you begin to show us your attempt?
I'm guessing this is an assignment for a lab pre-read, or after lab write-up. So maybe the answer is just written for you and you have to read it. Anyway, think a little bit about what happens if the absorbance is too low or too high in solution. What would that look like?