SCIENTIFIC TOOLS. Microscopes Light Microscope – (optical microscope) – Uses light to produce an enlarged view of a specimen. Magnification – Magnifying.

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Presentation transcript:

SCIENTIFIC TOOLS

Microscopes Light Microscope – (optical microscope) – Uses light to produce an enlarged view of a specimen. Magnification – Magnifying Power – How large an image looks under the microscope. Specimens are magnified by the objective lens and/or the occular (eyepiece) RESOLUTION – the sharpness of an image. Resolution is increased on high power. An image is “resolved” by using the fine adjustment (focus) knob.

TYPES OF MICROSCOPES Simple Microscope – magnifying glass Compound Microscope – Uses two lenses: objective and ocular. Stereomicroscope – a.k.a. Dissecting Microscope Used to view specimens too big for a compound light microscope

COMPOUND MICRSCOPE - OPTICAL SYSTEM Objectives – usually 2-3 for low power, medium power and high power. High power has a magnification of 40X (X means “times”) Medium power magnification is 10X Low power magnification is 4X Ocular is the part that you look through. Magnification is 10X To calculate TOTAL magnification, multiply the ocular (10X) by the objective magnification. Example: TOTAL magnification on high power would be 10 X 40 = 400 X

COMPOUND MICROSCOPE - MECHANICAL SYSTEM Structural parts of the microscope. Base – microscope stand. Stage – platform where the slide is placed. Stage clips – two metal clips that hold the slide in place. Body tube – contains the lenses. Eyepiece – at the top of the body tube. Nosepiece – At the bottom of the body tube and holds the objectives. By turning the nosepiece, the objectives are moved.

COMPOUND MICROSCOPE - MECHANICAL SYSTEM (cont’d) Focusing – Two adjustment knobs are used to focus the microscope. Coarse focus – Large knob and is used to initially bring the specimen into clear view. IT IS USED ON LOW POWER ONLY. – WHY??? THE STAGE MOVES WITH THE COARSE FOCUS AND ON HIGH POWER IT COULD BREAK THE SLIDE AND DAMAGE THE OBJECTIVE Fine focus – small knob and is used for “fine tuning” (resolution) the specimen. This is used at the high and low powers. WHEN USING THE HIGH POWER OBJECTIVE, ONLY USE THE FINE FOCUS.

COMPOUND MICROSCOPE - MECHANICAL SYSTEM (cont’d) Illuminator – The light source located on the base of the microscope. Diaphragm – mounted just below the stage and is used to regulate the amount of light on the specimen.

STEREOMICROSCOPE – DISSECTING MICROSCOPE Contains two eyepieces and provides a more 3- dimensional image of the specimen. It is used for dissecting small organisms or small parts of organisms. Used in ecological studies.

STEREOMICROSCOPE

LIGHT MICROSCOPE Coarse focus Fine focus Arm Stage clip Base Occular or eyepiece Body tube Revolving nosepiece Objective Stage Diaphragm Light source (illuminator)