Look At The Picture Of The Microscope. To Move The Objective Lens Up And Down, I Would Turn The _________ __________ Dial. Which Two Words Complete The Sentence? (2023)

FAQs

What dial should you turn to move the objective lens up and down? ›

COARSE ADJUSTMENT KNOB — A rapid control which allows for quick focusing by moving the objective lens or stage up and down. It is used for initial focusing. 5. FINE ADJUSTMENT KNOB — A slow but precise control used to fine focus the image when viewing at the higher magnifications.

Turn the revolving turret (2) so that the lowest power objective lens (eg. 4x) is clicked into position.

Revolving Nosepiece or Turret: This is the part that holds two or more objective lenses and can be rotated to easily change power.

Understanding Objective Lens

Many microscopes will be equipped with a scanning objective (4x), a low power objective (10x), a high power objective (40x), and perhaps even an oil immersion objective lens.

Coarse Focus: This is the knob on the side of the microscope that moves the objective lens up and down. It is used in conjunction with the fine focus. Coaxial Focus: A focusing system with both the coarse and fine focusing knobs mounted on the same axis.

Coarse Adjustment Knob- The coarse adjustment knob located on the arm of the microscope moves the stage up and down to bring the specimen into focus. The gearing mechanism of the adjustment produces a large vertical movement of the stage with only a partial revolution of the knob.

Coarse Adjustment Knob- The coarse adjustment knob located on the arm of the microscope moves the stage up and down to bring the specimen into focus.

To switch to the high power objective lens, look at the microscope from the side. CAREFULLY revolve the nosepiece until the high-power objective lens clicks into place. Make sure the lens does not hit the slide.

Always place the 4X objective over the stage and be sure the stage is at its lowest position before putting the microscope away. 9. Always turn off the light before putting the microscope away.

You can push down on the back end of the stage clip to open it. Look at the objective lens and the stage from the side (Figure 2, at right) and turn the coarse focus knob so that the objective lens moves downward (or the stage, if it moves, goes upward). Move it as far as it will go without touching the slide!

Why do you always look at the side when lowering the objectives? ›

(Always watch from the side whenever you move a specimen towards any objective lens to make sure the lens doesn't crash through the specimen and get damaged!)

The revolving nosepiece holds the objectives and allows for easy rotation from one objective lens to another.

Objective lenses come in various magnification powers, with the most common being 4x, 10x, 40x, and 100x, also known as scanning, low power, high power, and (typically) oil immersion objectives, respectively.

Your microscope has 4 objective lenses: Scanning (4x), Low (10x), High (40x), and Oil Immersion (100x).

Question: 40x (high power) Lens. Answer: Also called a high, dry objective; used for specimens that require a greater degree of magnification. Question: 100x (oil immersion) Lens. Answer: Used for viewing extremely small objects, such as blood cells or bacterial cells; this lens must be immersed in oil when used.

When using the high power objective, only the fine adjustmentknob should be used.

You should usually only need to use the coarse focus knob once for each new slide. Use it with the lowest power objective to get the specimen approximately in focus. After that, only use the fine focus knob, even after you change to a higher-power objective.

When focusing, always focus toward the specimen.

Coarse Adjustment Knob- The coarse adjustment knob located on the arm of the microscope moves the stage up and down to bring the specimen into focus.