three questions for chem lab on Beer’s Law.A = ebc where e is the molar absorptivity (constant) b is the path length c is the concentration and A is the absorbance.1) Notice that you don’t know e. Why is the calibration curve important?2) Why do we not use Beer’s Law to solve for c?And I found the absorbance for two unknown solutions:3) What wavelength do you measure the unknown sample at?