Microscope_and_the_Cell - BioLab3 Lab Report 3 Microscope...

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BioLab3Lab Report 3Microscope and the CellStudent Name:I.Purpose of the MicroscopeDefine the following terms.MagnificationThe degree to which the image of a specimen is enlargedResolving PowerHow well specimen detail is preserved during the magnifying process.ContrastThe ability to see specimen detail against its background. Stains and dyes are added to sections of biological specimens to increasecontrastII.The Compound MicroscopeEXERCISE 1 – Label the parts of the compound microscope1.Eyepiece2.Arm3.Course adjustment4.Fine adjustment5.Revolving nosepiece6.Objective lenses7.Stage clips8.Stage9.Iris diaphragm10.Condenser11.Light source12.Base © Access Learning Systems
Define the following terms.EyepieceLocated in the upper end of the body tube, this contains the ocularlens which focuses light on the retina of the eye. The power of the lens is 10x.ArmFunctions as a handle of the microscope.Course Adjustment KnobLarge knob used to make large movements of the objective lens when focusing on a specimen.Fine adjustment knobLocated either on top of the coarse adjustment knob or separately.Manipulating this knob clarifies detail of the specimen.Revolving nosepieceLenses are threaded into the revolving nosepiece. Allows for ease of movement between lenses.Objective lensesAttached to the revolving nosepiece. The number and magnification of the objective lenses vary with the type of microscope. The objective lenses are housed in several steel tubes that are threaded into the revolving nosepiece. The power of the objective lenses is usually 4X, 10X, 40X, and 100XStage clipsAttached to the stage and used to secure the slide in position.StageLarge platform just below the revolving nosepiece. The microscope. slide is placed on the stage.Iris diaphragm leverRegulates the size of the opening in the diaphragm.CondenserLocated between the diaphragm and the stage aperture. This structure converges light rays from the light source so that they pass through the specimen on the slide and into the objective lens.Light sourceLocated in the base of the microscope.BaseLowermost part of the microscope in contact with the table.© Access Learning Systems

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