GENERAL HISTOLOGY

Detailed explanation-1: -Field Diaphragm-an iris diaphragm, usually located on the base of the microscope that controls the amount of light that enters the condenser diaphragm.

Detailed explanation-2: -Iris Diaphragm controls the amount of light reaching the specimen. It is located above the condenser and below the stage. Most high quality microscopes include an Abbe condenser with an iris diaphragm. Combined, they control both the focus and quantity of light applied to the specimen.

Detailed explanation-3: -EXPLANATION: The pupil regulates and controls the amount of light entering the eye. So option 1 is correct.

Detailed explanation-4: -Diaphragm or Iris: 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.

Detailed explanation-5: -The size of the field diaphragm is controlled by rotating a knurled ring which is concentric with it. The field diaphragm controls the area of illumination. Locate the field diaphragm and its knurled ring. The magnification of an image is primarily controlled by the objectives which are housed in a rotating nose piece.