Best Answer: Coarse adjustment is used to focus the image on the microscope under low or medium power by using larger motions of the lens. Fine adjustment is used to focus the image on the microscope of only high power by using very tiny motions of the lens.
If you are interested in a simpler calculation that gives an approximation of dew point temperature if you know the observed temperature and relative humidity, the following formula was proposed in a 2005 article by Mark G. Lawrence in the Bulletin of the American Meteorological Society: Td = T - ((100 - RH)/5.)
With this handy tool, you can accurately calculate dew point and specific humidity (grains of water per pound of air) without fumbling through awkward psychrometric charts. Simply set the temperature and relative humidity; the specific humidity and dew point temperature are displayed in their respective windows.