Table of Contents
- 1 Why must you not use the coarse focus knob of a microscope when looking through the 10X 40X or 100X objective lenses?
- 2 At which magnification should you never use the coarse focus adjustment?
- 3 Why is it always necessary to focus with the fine adjustment in high magnification?
- 4 Does the coarse adjustment knob on the microscope locates the focus plane?
- 5 What is the difference between coarse focus and fine focus?
Why must you not use the coarse focus knob of a microscope when looking through the 10X 40X or 100X objective lenses?
If you focus the high power objectives with the coarse focus knob, then you risk slamming the objective into the slide, risking the damage of both. Some high power objectives are spring-loaded, with a front-part that retracts when touched by the slide. This is a protective mechanism.
At which magnification should you never use the coarse focus adjustment?
The coarse adjustment knob is used ONLY with the low power (4X, 10X) objectives. When focusing under the 40X or 100X objective, ONLY use the fine adjustment, never the coarse adjustment. Refer to each of the following procedures every time the microscope is used.
Why should you never use coarse adjustment when focusing the high power objective?
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. Lower the stage completely, remove the slide, and carefully place into the correct box.
What kind of focusing is the coarse adjustment knob used for?
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.
Why is it always necessary to focus with the fine adjustment in high magnification?
Why should you only use the fine adjust when the high-power objective is in position? Because the objective is so close to the stage/ specimen and you don’t want to damage anything .
Does the coarse adjustment knob on the microscope locates the focus plane?
It contains a prism at the base of the tube that bends the light rays so they can enter the inclined tube. 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.
When focusing your microscope you must never use the focus knob when using the lens?
Course adjustment knob – Use this knob to focus your slide when using the lowest power objective (10x). IMPORTANT: Never use the course adjustment knob when focusing the medium- or high-power objective! This can break the slide and scratch the objective lens!
When focusing on a specimen the fine adjustment knob should be used with which of the following objectives?
The fine adjustment knob is used on the higher objectives and brings the image into sharper focus. It moves the stage slightly compared to the coarse adjustment knob. Discuss the use, care, and maintenance of the microscope. You just studied 10 terms!
What is the difference between coarse focus and fine focus?
Focus (coarse), The coarse focus knob is used to bring the specimen into approximate or near focus. Focus (fine), Use the fine focus knob to sharpen the focus quality of the image after it has been brought into focus with the coarse focus knob.