First lab. The Microscope

First lab.
The Microscope
An Introduction to the Laboratory
There are a number of general rules that the Biology Department expects to be followed when you are in the Laboratories:
? Do not eat or drink in the laboratory
? Report all spills and accidents to your demonstrator immediately
? Always wash your hands at the end of a laboratory
? Upon completion of laboratory exercises, place all materials in the area or container designated by your demonstrator
? Leave the lab clean and organized at the end of each lab period.
A microscope is a precision instrument and an essential tool in the study of cells, tissues, and minute organisms. It must be handled and used carefully at all time.
Or :- is a designed to make objects visible that are to difficult or to small to see with the unaided eye.
There are two type of microscope can be study in this laboratory :-
1- Light (Compound ) microscope.
2- Stereo (Dissecting ) microscope.
Parts of the light microscope and its function:- figure -1-
1- The base :- rest on the table and act as a stand for the microscope and houses the lamp- and a light switch.
2- Voltage control knob :- which regulates light intensity, located near the light switch.
3- The arm :- rises from the base and supports the stage, lens system, and control mechanisms.
4- The stage :- supports the specimen to be viewed. A mechanical stage can be moved right and left and back and forth by tow stage adjustment knobs.
5- Stage clips :- hold the slide in place.
6- A condenser :- is located below the stage . It concentrate light on the object being observed . It may lowered or raised by condenser control knob.
7- An iris diaphragm :- is built into the condenser, which enables you to control the amount of light entering the lens system.
8- The ocular lens (eyepiece) :- is located at the upper end of the body tube if the microscope is monocular but in binocular microscopes , the oculars are attached to arotatable head .attached to the body tube.
9- The rotatable head :- allows a choice of viewing positions, and it is locked in place by a lack screw.