The Microscope

Parts of a microscope

• Arm – basic frame, used to carry microscope

Parts of a microscope

• Base – bottom stand, houses the light source

Parts of a microscope

• Body tube – contains mirrors to reflect light into the eyepiece

Parts of a microscope

• Eyepiece – ocular lens, nearest the eye, magnifies the image 10x

Parts of a microscope

• Nosepiece – rotating part that holds the three objective lenses

Parts of a microscope

• Objective lenses – lens closest to the specimen, magnifies the image

Parts of a microscope

• High power – magnifies 40x• Medium power – magnifies 10x• Low power – magnifies 4x

Parts of a microscope

• Stage – flat, table-like surface where the slide is placed

Parts of a microscope

• Stage clips – hold the slide on the stage

Parts of a microscope

• Diaphragm – disk-shaped device below the stage that controls the amount of light passing through the slide

Parts of a microscope

• Corse adjustment knob – roughly focuses the image by moving the stage up or down quickly

Parts of a microscope

• Fine adjustment knob – clarifies the image by moving the stage small distances slowly

Parts of a microscope

• Light source – the beam of light that passes through the slide

Use of the Microscope

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Magnification

• The number of times an object’s apparent size is increased by the lenses

Total magnification

• Multiply the two magnifications together

Eyepiece Objective lens Total Magnification

10x 10x

10x 40x

10x 4x

5x 10x

5x 40x

20x 10x

20x 40x

15x 20x

25x 30x

Parts of the microscope