What particle concentration will give a signal-to-noise ratio of 1.5 in a 50-µm-deep microchannel (Table 4.6)? What are the characteristics of the imaging system necessary to achieve this...

What particle concentration will give a signal-to-noise ratio of 1.5 in a 50-µm-deep microchannel (Table 4.6)? What are the characteristics of the imaging system necessary to achieve this signal-to-noise ratio? What happens to the signal-to-noise ratio if this particle concentration is used in a channel that is 150 µm deep?