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Why should you never begin with the high power objective?

Why should you never begin with the high power objective?

Never begin with the high power objective (40X). This is not because we do not trust you. This is not because we do not think you know what you are doing. As magnification increases, the field of view decreases and it becomes more difficult to focus.

Why should you never use high power?

NEVER USE THE COARSE ADJUSTMENT KNOB when ON HIGH POWER. This can cause damage to the slide, the objective lens or both. Again, searching for a specimen on the slide NEVER USE THE HIGH POWER OBJECTIVE to begin with! Below the objectives, there is a flat square with a hole in it. This is called the STAGE.

Why is it not advisable to use a microscope on high power?

When using a light microscope it’s important to start with the low power objective lens as the field of view will be wider, increasing the number of cells you are able to see. Extra care is needed here because the high-powered lens can become damaged as it’s very close to the slide.

What do you never use with the high power objective?

COARSE FOCUS KNOB
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.

Why is it more difficult to locate an object starting with the high power objective than with the low power objective?

Why is locating an object more difficult if you start with the high-power objective than with the low-power objective? Because the high power brings the object closer so it might be difficult to focus.

Why must you be careful when you are focusing the high power objective lens?

Objective Lenses – The objective lens gathers light from the specimen, magnifies the image of the specimen, and projects the magnified image into the body tube. You must be very careful when using the high power lenses so you do not jam them into the slide.

Why don’t we use the coarse adjustment anyhow when using a high power objective lens?

Coarse and fine adjustment The coarse adjustment knob should only be used with the lowest power objective lens. Using the coarse focus with higher lenses may result in crashing the lens into the slide.

Why must you be careful when you are focusing with the high power lens?

When using the high power lens do you only use fine focus not coarse?

5. 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.

Why is it not advised to change an objective lens directly from one with a very low magnification to one with a very high magnification or vice versa?

Changing from low power to high power increases the magnification of a specimen. The amount an image is magnified is equal to the magnification of the ocular lens, or eyepiece, multiplied by the magnification of the objective lens.

Why must you never use the coarse adjustment to focus under high power?

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.

Why should you always focus an object on a lower power before focusing on high power?

The depth of focus is greatest on the lowest power objective. Each time you switch to a higher power, the depth of focus is reduced. Therefore a smaller part of the specimen is in focus at higher power. Again, this makes it easier to find an object on low power, and then switch to higher power after it is in focus.

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