Author Question: What is the difference between parfocal and parcentric? How do the parfocal and parcentric ... (Read 36 times)

appyboo · **on:** Jul 21, 2018

What is the difference between parfocal and parcentric? How do the parfocal
and parcentric properties of the compound light microscope affect its use?

What will be an ideal response?

Question 2

How wide is the field of view? Record your measurement in Table 3-2 of the
lab manual.

What will be an ideal response?

gabrielle_lawrence · **Reply #1 on:** Jul 21, 2018

Answer to Question 1

Parfocal is the property of a compound microscope that relates to focus. When an
object is in focus using a low-power objective, and the objective is switched, the object
should remain in focus. Parcentric refers to the relative position of an object in the
field of view. When an object is in the center of the field of view under lower-power
magnification and when the objective lens is switched, the object should still be in the
center of the field of view. If the lenses of the compound microscope are properly
aligned, the parfocal and par-centric properties of the microscope should increase the
speed of focus under a variety of magnifications and make the location of the object
being viewed far easier.

Answer to Question 2

The diameter of the field of view under the 400X (high-dry) objective is calculated
as the diameter measured for the 4X divided by 10. The diameter of the field of
view under the 100X objective is 0.45 mm or 450 m.