The depth of the focal plane is, besides the wavelength of light, determined in particular by the numerical aperture of the objective used and the diameter of the diaphragm.
At a wider detection pinhole the confocal effect can be reduced.
To obtain a full image, the image point is moved across the specimen by mirror scanners.
The emitted/reflected light passing through the detector pinhole is transformed into electrical signals by a photomultiplier and displayed on a computer monitor screen.
Major improvements offered by a confocal microscope over the performance of a conventional microscope may be summarized as follows: