NEED ASAP!
You need to measure several chemical species in solution using adsorption spectroscopy that absorb from 450 to 600 nm. The difference is adsorption maximums is 0.39 nm and cost is not an issue but you should not pay for components you don't need.. Additionally, you need to have a detection limit as low as possible with a 1 cm cuvette. Draw a simple diagram of the spectrometer that would meet you needs. Label all parts and tell me specifics about the components (bits, F-number, exit slit width, D-1 specifications, etc).

Helpful information: You need decent F-number optics but you don't need super low F numbers. PMTs and CCDs can have similar bit ratings.