Colorimeter question Watch
When light passes through a filter to the solution and then to a photoelectric cell, what happens in order for the photoelectric cell and the things after it to determine what colour the solution is? 😄
One of the (now coloured) beams passes through the sample and the other through the reference. The instrument compares the two signals to decide what percentage of the light has been absorbed be the sample.
It makes no decision about the colour.