EXERCISE 1 THE COMPOUND MICROSCOPE Flashcards
Is a removable cylinder in the top portion of the microscope. This is a lens mounted in a steel cylinder through which we view the specimen. It is provided with a pointer used in pointing specific parts of the specimen. It has a magnification of 10x which means that it magnifies 10 times the actual size of the specimen.
EYEPIECE OR OCULAR
are series of lenses placed immediately over the specimen for the purpose of magnification.
OBJECTIVES
is the shortest cylinder with
every large lens opening, which gives the
general view of the specimen with the
magnification of 4x.
SCANNER
conventionally
gives a magnification of 10x.
LPO
usually magnifies 40x. This objective gives more focal and more
HPO
the longest and a special objective used for
viewing specimen. With the aid of the
cedar oil, gives a magnification of 100x. Oil
immersion-viewing refractive index than
air. Oil immersion viewing can increase the
microscope
OIO
a part use to reflect light through the specimen, lenses and into the eye.
MIRROR
a lens mounted within the substage positioned below the aperture of the stage. This is used to concentrate the reflected light from the mirror to the specimen being examined.
CONDENSER
a small cylinder attached to the upper part of the body tube and holds the eyepiece.
DRAW TUBE
a hollow cylinder that serves the draw tube to the microscope. This is also used as passageway of light from the objectives to the ocular.
BODY TUBE
a plate to which the objectives are attached. It revolves around the central screw in order to put the desired objective over the specimen.
REVOLVING NOSEPIECE
a plate fixed between the lower end of the tube and the revolving nosepiece. It protects the objectives from dust.
DUST SHIELD
is a platform-like structure immediately below the objectives on which the micro specimen is placed. A central opening the stage aperture is present to allow light to be reflected from the mirror to the specimen. The stage is also provided with adjustments screws.
STAGE
a metal springy bar fitted to the stage to hold themicro slide in place during microscopy.
STAGE OR SPRING CLIP
a gadget found beneath the stage, which bears the condenser and the diaphragm.
SUBSTAGE
a device that regulates the amount of light to
pass through the stage aperture. It is either of the iris type or the disk type.
DIAPHRAGM
the part that connects the tube to the base. This is used for holding or carrying the microscope. In carrying the microscope you must grasp it firmly by holding the arm with your right hand supporting the base with your left hand .
ARM
are found usually near the pillar consisting of 2 types:
ADJUSTMENT KNOBS
a larger knob used to adjust the distance between the lens of the objective and the specimen in order to obtain the set focus.
COARSE ADJUSTMENT KNOB
a smaller knob, which is
used for sharp focus after the micro
specimen, has been brought into view with
the coarse adjustment.
FINE ADJUSTMENT KNOB
is located at the lower left side just in front of the coarse and fine adjustments knobs. It is used in moving the substage up and down. This part may not be present in some models of electric microscopes
SUBSTAGE ADJUSTMENT KNOB
is a tiny lock located at the upper side of the
microscope. This is used to lock or prevent the stage from moving upward. This part is absent in some models of microscope.
PRE-SET FOCUS LOCK
is the post or vertical extension of the base and to which the arm is attached. It supports the upper structures of the microscope.
PILLAR
a horseshoe like structure which affords footing of the microscope.
BASE
Can be found through the naked eye
Macroscopic
Cannot be seen through our naked eye like atoms and molecules
Microscopic
