QUESTION IMAGE
Question
sc.912.l.14.4 review the parts (structure and function) of the compound microscope
- label the following parts of a compound microscope and describe below each of their functions.
diagram of compound microscope with labels a - n and g - n
- describe the differences between the compound light microscope, dissecting microscope, transmission electron microscope, and scanning electron microscope.
chart with columns: compound light microscope, dissecting microscope, transmission electron microscope, scanning electron microscope, and empty rows for descriptions
Brief Explanations
For question 15 (labeling microscope parts and functions):
- g (Eyepiece/Ocular Lens): Magnifies the image from the objective lens for viewing.
- h (Body Tube): Connects the eyepiece to the objective lenses, maintains light path.
- i (Revolving Nosepiece): Holds objective lenses, allows switching between them.
- j (Objective Lenses): Magnify the specimen; typically low, medium, high power.
- k (Specimen on Slide): The object being observed, placed on the stage.
- l (Stage): Platform to hold the slide with the specimen.
- m (Diaphragm/Aperture Diaphragm): Controls the amount of light reaching the specimen.
- n (Mirror/Illuminator): Reflects light (mirror) or provides light (illuminator) to illuminate the specimen.
- a (Coarse Adjustment Knob): Moves the stage/specimen up/down for rough focusing.
- b (Fine Adjustment Knob): Sharpens the image after coarse focusing.
- c (Arm): Supports the body tube and connects to the base.
- d (Stage Clip): Holds the slide in place on the stage.
- e (Inclination Joint): Allows tilting the microscope for viewing comfort.
- f (Base): Provides stability and support for the microscope.
For question 16 (differences between microscopes):
| Microscope Type | Key Differences |
|---|---|
| Dissecting Microscope (Stereo Microscope) | Uses visible light, has two eyepieces for 3D view, lower magnification (up to ~100x), views larger, opaque specimens (e.g., insects, plants), 3D image, used for dissection. |
| Transmission Electron Microscope (TEM) | Uses electrons (electron beam), very high magnification (up to millions of x), views thin, sliced specimens (e.g., cell sections), 2D image, reveals internal structures. |
| Scanning Electron Microscope (SEM) | Uses electrons, high magnification (up to ~100,000x), views surface of specimens (e.g., insect exoskeleton), 3D image, reveals surface details. |
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Question 15 Labels and Functions:
- g: Eyepiece (magnifies image for viewing)
- h: Body Tube (connects eyepiece to objectives, maintains light path)
- i: Revolving Nosepiece (holds objectives, allows switching)
- j: Objective Lenses (magnify specimen, various powers)
- k: Specimen (object on slide being observed)
- l: Stage (platform for slide)
- m: Diaphragm (controls light intensity)
- n: Mirror/Illuminator (provides light to specimen)
- a: Coarse Adjustment Knob (rough focusing)
- b: Fine Adjustment Knob (fine focusing)
- c: Arm (supports body tube, connects to base)
- d: Stage Clip (holds slide)
- e: Inclination Joint (tilts microscope)
- f: Base (supports microscope)
Question 16 Differences (Summary Table):
| Microscope Type | Magnification | Light Source | Specimen Type | Image Type | Key Use |
|---|---|---|---|---|---|
| Dissecting | ~10–100x | Visible light | Larger, opaque | 3D | Dissection, viewing large specimens |
| Transmission Electron (TEM) | Up to millions x | Electron beam | Thin, sliced | 2D | Internal cell structures |
| Scanning Electron (SEM) | Up to ~100,000x | Electron beam | Surface of specimens | 3D | Surface details |