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.)
In general, when the relative humidity is high (the air is nearly saturated with moisture) the dew point will be close to the air temperature (at 100% Relative Humidity, the dew point is equal to the air temperature). When the relative humidity is low, the dew point is much lower than the air temperature. If the amount of water in the air remains constant, the dew point will be steady, even as the temperature changes. Conversely, if the dew point is rising, more moisture is being absorbed by the air.