Question

1) How does spectral bandpass affect instrumental light throughput?

Answer 1

It is always recommend to use small width to avoid any polychromatic deviation durning the measurement of absorption spectrum, the smaller the width of slit smaller will be the bandpass. But if width is too small then signal to noise ratio decreases, and if our aim is to find the concentration then signal to noise ratio should be high so it becomes useful to increase the width of slit.

The Spectral throughput or power directly proportional to slit width therefore it may be conclude that spectral throughput is also directly proportional to the spectral bandpass.