Ocular (eyepiece) Remagnifies the image formed by the objective lens Ocular lens Body tube Transmits Line of vision the image from the ob- jective lens to the ocular Path of light Arm Prism Objective lenses Primary Body tube lenses that magnify the specimen Objective Stage Holds the lenses microscope slide in position Specimen- Condenser Focuses light through specimen Condenser lenses Diaphragm Controls the amount of light entering the condenser Illuminator Coarse focusing knob llluminator Light source- Base with source of Base- illumination Fine focusing knob (a)Principal parts and functions (b)The path of light(bottom to top) Figure A-6 The Compound Light Microscope.(a)A compound light microscope.(b)The path of light through the compound microscope. 王研物甲主讲：汤 华