Parts and Functions of a Microscope

Microbiology & Parasitology Midterms - BASIC TOOLS IN MICROBIOLOGY

Ocular or Eyepiece

Part of the optical system through which the specimen is viewed

Eyepiece Tube

Holds the eyepiece in place above the objectives

Body Tube

Hollow cylindrical tube; light passes here from the objectives to eyepiece

Coarse Adjustment Knob

Used to bring object into focus

Fine Adjustment Knob

Used for maximum definition

Revolving Nosepiece

3 parfocal objectives are attached; allows for convenient exchange of the objectives

Objective Lenses

Part of the optical system that produces the specimens initial (real) magnified image

How many types of objective lenses are in a compound microscope?

4

Which objective lens has a magnification power of 4x?

Scanner Objective

Which objective lens has a magnification power of 10x?

Low Power Objective (LPO)

Which objective lens has a magnification power of 40x?

Medium Power Objective (MPO)

Which objective lens has a magnification power of 100x?

High Power Objective (HPO)

Condenser

Concentrates light received from the mirror; sends light to the objectives

Arm

Permits adjustment of the stage to the desired angle

Specimen Stage

Horizontal platform where specimen to be examined is placed

Aperture

The hole in the stage through which the base light reaches the stage

Iris Diaphragm

Regulates amount of light entering the condenser

Mirror Illuminator

Reflects light into the condenser

Base

Keeps microscope steady at any position