Question

Lab activities and worksheets Read through this section before you get to lab so you are aware of what you will be doing for this lab. Microscope labeling It is important to know the structure of something in order to know how it works and how to use it. Use the following list of parts of a compound microscope to label the diagram. Be sure to understand the functions of each part. Ocular: this is the lens at the top of the microscope, the one you look through. It usually has a magnification of 10 times (10x). It may contain a pointer that is used to point to something on the slide. Objectives: a compound microscope has 3 or 4 lenses that sit directly above the specimen and can be rotated into place. The shortest has the least magnification and the longest has the most magnification. • Scanner - 3 or 4 times . Low power - 10 times High power - 40 times • Oil immersion - 100 times (not all microscopes have oil immersion) Arm: connects the objective lens to the base Base: the bottom illuminator: the source of light, usually a lamp sitting on the base, but it could be an external lamp Condenser: located just below the stage, the condenser focuses the light from the illuminator onto the specimen. The adjustment knob raises and lowers the condenser. Diaphragm: regulates the amount of light going through the condenser to the specimen. The adjustment lever, handle, or knob opens and closes the diaphragm. Using the condenser and the diaphragm together provides the light necessary to see the specimen. Stage: the platform where the specimen sits. The specimen is on a slide which is placed on the stage. Nosepiece: the revolving nosepiece sits below the ocular lens and it houses the objective lenses. The nosepiece will rotate to move the various objective lenses into position. Coarse adjustment: moves the body tube and the objective lenses over greater distances and is used for getting a specimen into course focus at very low magnification, using the scanner objective. Fine adjustment: moves the body tube and the objective lenses small distances and is used for fine focus at higher magnification, using the low power, high power, or oil immersion objectives. Stage clip: holds the microscope slide in place on a compound microscope. 10 Page

Answer 1

Microscope is an important instrument in a lab by which we can examine small objects and structures. As per the question, different parts of a microscope are labeled in the below picture.

Ocular Am Nosepiece Objectives Stage clip Stage Condenser Diaphragm Coarse adjustment Fine adjustment Illuminator Base Parts of a microscope