BIOL Manual PDF

1- Base: the bottom, supports the microscope. 2- Arm: supports and connects the eyepiece lens to the base. Helps to carry the microscope easily. 3- Light source: provides light to illuminate the specimen. 4- On-Off Switch: turns the illuminator on or off. 5- Light source control: adjusting (incr...

1- Base: the bottom, supports the microscope. 2- Arm: supports and connects the eyepiece lens to the base. Helps to carry the microscope easily. 3- Light source: provides light to illuminate the specimen. 4- On-Off Switch: turns the illuminator on or off. 5- Light source control: adjusting (increases or decreases) the amount of light traveling from the light source at the base up to the stage. 6- Condenser assembly: Contains a condenser lens that collects the light from the light source and focuses it on the specimen. 7- Condenser adjustment control: Moves the condenser assembly up or down to increase or decrease the amount of light. 8- Iris diaphragm: Controls the amount of light reaching the specimen. 9- Stage: holds the slide for observation. 10- Specimen holder: it holds the slide in place at the top of the stage. 11- Specimen holder control: adjust slide position by moving the specimen holder. It has two knobs: the upper large knob moves the specimen forward and backward while the lower small knob moves it from right to left or left to right. 12- Coarse focus controls: It brings the specimen in and out of focus by moving the stage up or down for relatively large distances. 13- Fine focus controls: It moves the stage up and down smaller distances to bring the specimen into sharp focus. 14- Objective lenses: there are four objective lenses with different magnification powers Scanning Objective (4X): useful for getting an overview of the slide. It is safe to start observation with this lens. Low Power Objective (10X): useful for viewing slides and good to examine most of the specimen features. High Power Objective (40x): useful for observing fine details such as the striations in skeletal muscle. Oil Immersion Objective (100X): used for observing the details of individual cells such as white blood cells. It must be used with a specially formulated oil. 15- Revolving nosepiece: holds the objective lenses. By turning, clockwise or anticlockwise, it changes the objective lenses. 16- Binocular tube: Divides the light passing through the objective lens into two beams, each beam goes to one eyepiece lens. 17- Eyepiece or Ocular lens: a lens through which you look. It has a magnification of 10X. 18- Pointer: Points to a specific location or structure within the specimen.