A photometer with a linear response to radiation gave a reading of 690 mV with a blank in the light path and 169 mV when the blank was replaced by an absorbing solution. Calculate
(a) The transmittance and absorbance of the absorbing solution.
(b) The expected transmittance if the concentration of absorber is one half that of the original solution.
(c) The transmittance to be expected if the light path through the original solution is doubled.