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Table of Contents
  1. What is the ability to distinguish between two nearby objects is called?
  2. What do compound microscopes focus light through to produce a magnified image?
  3. What is the condition when objects appear larger than they really are?
  4. What is a cell’s functions can include obtaining food and water and getting rid of?
  5. What can a cells function get rid of?
  6. When using microscopes What are the two variables that matter the most?
  7. Does a stereomicroscope have more DOF at high or low magnification?
  8. What magnification do you need to see cells?
  9. How could we build a microscope with a higher resolution?
  10. What is the best resolution of a light microscope?
  11. What is the limit of resolution?
  12. Which level of magnification requires the most illumination for the best clarity and contrast?
  13. Which set up has the highest total magnification lowest magnification?
  14. What new details are you able to see on the slide when the magnification is increased to 10X?
  15. What happens to the brightness of the view when you go from 4 to 10?
  16. What happens if you try to use the coarse adjustment when the 10X lens is in place?
  17. Why is it bad to use the coarse adjustment on high power?
  18. What objective lens should you use first?
  19. When would you use a fine adjustment knob?
  20. What sharpens the image under high magnification?
  21. What happens when you turn the fine adjustment knob away from you?
  22. Why is it always necessary to focus with the fine adjustment in high magnification?
  23. What happens to a microscope if place at the edge?
  24. What should not be touched when using the high power objective?
  25. What will happen if you use direct sunlight to observe your specimen?
  26. What controls how much light passes through the specimen?
  27. What is the shortest objective lens?

What is the ability to distinguish between two nearby objects is called?

Resolution is the ability to distinguish two objects from each other. Light microscopy has limits to both its resolution and its magnification.

What do compound microscopes focus light through to produce a magnified image?

4. Light microscopes use beams of electrons to produce magnified images. 5. Resolution is the condition when objects appear larger than they really are.

What is the condition when objects appear larger than they really are?

Resolution is the condition when objects appear larger than they really are. Magnification is the ability to distinguish details on an object.

What is a cell’s functions can include obtaining food and water and getting rid of?

Cards

Term A cell’s functions can include obtaining food and water and getting rid of ________________________. Definition wastes
Term What is the cell theory? Definition * all cells are produced from other cells * all living things are composed of cells * cells are the basic units of structure and function

What can a cells function get rid of?

They can digest peptides, nucleic acids, carbohydrates, and lipids. This is how cells recycle materials like amino acids and glucose. They’re also responsible for removing cellular clutter and breaking down unwanted molecules in the cytoplasm.

When using microscopes What are the two variables that matter the most?

Two parameters are especially important in microscopy: magnification and resolution. Magnification is a measure of how much larger a microscope (or set of lenses within a microscope) causes an object to appear.

Does a stereomicroscope have more DOF at high or low magnification?

Depth of field is greater at lower magnifications. Object field: The diameter of the circular area of sample that is visible through the microscope at one time. Magnification and object field are inversely related, that is, at higher magnifications a smaller area of the sample is visible.

What magnification do you need to see cells?

400x

How could we build a microscope with a higher resolution?

To achieve the maximum (theoretical) resolution in a microscope system, each of the optical components should be of the highest NA available (taking into consideration the angular aperture). In addition, using a shorter wavelength of light to view the specimen will increase the resolution.

What is the best resolution of a light microscope?

200 nm

What is the limit of resolution?

The limit of resolution (or resolving power) is a measure of the ability of the objective lens to separate in the image adjacent details that are present in the object. It is the distance between two points in the object that are just resolved in the image.

Which level of magnification requires the most illumination for the best clarity and contrast?

45x

Which set up has the highest total magnification lowest magnification?

Answer: 1.So for 10X objective and 10X ocular, Total magnification = 10 X 10 = 100X (this means that the image being viewed will appear to be 100 times its actual size). A scanning objective lens provides the lowest magnification power of all objective lenses.

What new details are you able to see on the slide when the magnification is increased to 10X?

At 10x magnification, the cell wall or the cell membrane can be visualized along with the cell’s complete shape. The cell organelles and the cytoplasm will not be visible. AT 4x, the cell will look like blurry shapes, but with 10x the characteristic shape, the cell membrane of the cell can be visualized.

What happens to the brightness of the view when you go from 4 to 10?

Light Intensity Decreases Image brightness is inversely proportional to the magnification squared. Given a fourfold increase in magnification, the image will be 16 times dimmer.

What happens if you try to use the coarse adjustment when the 10X lens is in place?

What happens if you try to use the coarse adjustment when the 10X lens is in place? The focus of the specimen would be unclear with a high objective power and the stage lifted high due to the coarse adjustment. “You only use the coarse focus knob when the 4X scanning objective is in place.”

Why is it bad to use the coarse adjustment on high power?

NEVER USE THE COARSE FOCUS KNOB ON HIGH POWER! The high power lens should be very close to your slide when in proper focus. If you turn the coarse adjustment knob while on high power, the objective could easily break your slide.

What objective lens should you use first?

When focusing on a slide, ALWAYS start with either the 4X or 10X objective. Once you have the object in focus, then switch to the next higher power objective.

When would you use a fine adjustment knob?

Fine Adjustment Knob – This knob is inside the coarse adjustment knob and is used to bring the specimen into sharp focus under low power and is used for all focusing when using high power lenses. Light Source – The light source in your microscope is a lamp that you turn on and off using a switch.

What sharpens the image under high magnification?

Coarse adjustment knob- Focuses the image under low power (usually the bigger knob) Fine adjustment knob-Sharpens the image under all powers (usually the smaller knob) Arm- supports the body tube and is used to carry the microscope.

What happens when you turn the fine adjustment knob away from you?

Which Way Do I Turn the Knob? If your eyepiece(s) on your microscope is built facing away from the arm of the microscope then turning the knob away from you will raise the stage and turning the knob towards you will lower the stage.

Why is it always necessary to focus with the fine adjustment in high magnification?

Coarse and fine adjustment The coarse adjustment knob should only be used with the lowest power objective lens. Once it is in focus, you will only need to use the fine focus. Using the coarse focus with higher lenses may result in crashing the lens into the slide.

What happens to a microscope if place at the edge?

Answer: When the object on your slide is in focus for each objective, the distance between the slide and the objective lens, the working distance, decreases as the objective magnification increases.

What should not be touched when using the high power objective?

The objective at the highest position, the 4x objective should of course not touch the slide. Close the condenser and looking through the eyepiece lower the stage using the coarse focus until you see a clear image. Only rotate the coarse focus into one direction and stop when you see a clear image.

What will happen if you use direct sunlight to observe your specimen?

Never use direct sunlight; it may damage your eyes. Color the light source yellow. After the light has passed through the specimen, it enters the objective lens (often called “objective” for short).

What controls how much light passes through the specimen?

You can control how much light goes through the specimen by adjusting the diaphragm (K). It has a range of 1 to 5, with 5 being the most light. Color the diaphragm green. Since any slight movement of the specimen is magnified many times, the slide is usually held down by a pair of stage clips (J).

What is the shortest objective lens?

A scanning objective lens that magnifies 4x is the shortest objective and is useful for getting a general overview of a slide. A low-power objective lens magnifies 10x, but remember that it is coupled with an eyepiece lens, so the total magnification is 10x times the power of the eyepiece lens.