Page 21 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six

Biology for Secondary Schools

Eyepiece lens

Ocular tube

Coarse adjustment
FOR ONLINE READING ONLY
knob Body tube
Fine adjustment
knob

Rotating nosepiece
Arm Objective lens

Stage clip

Stage
Condenser
Hinge screw
Diaphram
Mirror
Base

Figure 2.12: Parts of the light microscope

The parts of the light microscope are described in Table 2.1.
Table 2.1: Parts of the light microscope and their functions
Part Function
Eyepiece Has a lens that magnifies the specimen five times
(5×), ten times (10×), or fifteen times (15×)
Body tube Supports the eyepiece and the rotating nosepiece
Rotating nosepiece Supports the objective lenses. Rotates to allow
changes from one lens to another
Objective lenses Magnify the object under observation. Light micro-
scope usually has three objective lenses: low power,
medium power, and high power. A high-power lens
reveals more details of the specimen
Coarse adjustment knob Rises or lowers the body tube in order to bring the
image into focus

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