Many microscopes have a rotating disk under the stage. This diaphragm has different sized holes and is used to vary the intensity and size of the cone of light that is projected upward into the slide. There is no set rule regarding which setting to use for a particular power. Rather, the setting is a function of the transparency of the specimen, the degree of contrast you desire and the particular objective lens in use.
when should the coarse wheel adjustment be used
Many microscopes have a rotating disk under the stage. This diaphragm has different sized holes and is used to vary the intensity and size of the cone of light that is projected upward into the slide. There is no set rule regarding which setting to use for a particular power. Rather, the setting is a function of the transparency of the specimen, the degree of contrast you desire and the particular objective lens in use.
The radial and circular muscles of the iris.
stage height adjustment
The function of a microscope's coarse adjustment knob is to improve focus on the object under study by adjusting the lens. Unlike the fine adjustment, coarse adjustment moves the lenses quickly.
it is used as fine adjustment to increase resolution of microscope
There will need to be an alignment done on the vehicle to straighten the steering wheel properly. The adjustment to make it straight is called a "toe Adjustment". If it pulls while driving causing the steering wheel not to be straight it will need a Caster or Camber adjustment or all of these may need adjustmnet.
there is not one
Could be worn ball joints, worn steering linkages, worn/out of adjustment steering box and or worn/out of adjustment wheel bearings.
function of iris diaphragm
It is used to cut soft tissue.
The iris controls the size of the pupil. Which in turn, controls the amount of light entering the eye.