The photochemical law governing chemical conversion of a photoactive species is derived and solved
analytically. In the absence of solution mixing, the law predicts a remarkable symmetry in which the
dependence of light intensity on distance matches the dependence of concentration on time. An exact
method is described whereby a time sequence of experimental transmittance/absorbance data obtained
during a light-induced chemical process can provide a value of the quantum yield for the photoreaction.
It is demonstrated that this procedure is not invalidated by solution mixing