What is the importance of adjusting the light intensity when viewing specimens with a compound microscope?
improve viewing quality or minimize eye strain from bright light
.
Why is it important to adjust light intensity on a microscope?
It is important to adjust the light intensity
when viewing specimens in order to create the proper contrast to view the organism correctly
. … Specimens viewed with a compound microscope must be thi so that light can pass through them so they can be viewed.
Why is it important to only use the fine adjustment when viewing a specimen under high power with the compound light microscope?
Use ONLY the fine adjustment knob
to focus 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.
Why is light used in a microscope and how can the light be adjusted?
Brightness is related to the illumination system and can be changed by changing the voltage to the lamp (rheostat) and adjusting the condenser and diaphragm/pinhole apertures
. Brightness is also related to the numerical aperture of the objective lens (the larger the numerical aperture, the brighter the image).
What is the importance of a compound light microscope?
Compound microscopes
can magnify specimens enough so that the user can see cells, bacteria, algae, and protozoa
. You cannot see viruses, molecules, or atoms using a compound microscope because they are too small; an electron microscope is necessary to image such things.
What increases or decreases the light intensity on a microscope?
There are essentially three ways to vary the brightness; by increasing or decreasing the light intensity (using the on/off knob), by moving the
condenser
lens closer to or farther from the object using the condenser adjustment knob, and/or by opening/closing the iris diaphragm.
Does the light intensity increase or decrease as the magnification increases?
The
light intensity decreases as magnification increases
. There is a fixed amount of light per area, and when you increase the magnification of an area, you look at a smaller area. So you see less light, and the image appears dimmer.
What to do if more light is needed to view the specimen?
Slides should be held by the edges, avoiding the cover glass area. Always begin viewing a slide using the
microscope’s lowest magnification
. This reduces the risk of contact by the microscope’s objective lens. Afterwards, switch to a higher magnification if needed.
Why should you only use the fine focus knob at higher magnification?
2. 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
.
Why is it important to only use the fine adjustment knob on high power?
2. 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
.
Which of the following can be used to adjust the light on the microscope?
Use
the condenser diaphragm
to reduce the amount of light and increase the contrast of the image. Condenser Focusing Knob – This control is used to precisely adjust the vertical height of the condenser. Condenser Lens – This lens system is located immediately under the stage and focuses the light on the specimen.
What three parts of the microscope adjust light?
What three parts of the microscope adjust light?
Iris diaphragm
: Adjusts the amount of light that reaches the specimen. Condenser: Gathers and focuses light from the illuminator onto the specimen being viewed. Base: The base supports the microscope and it’s where illuminator is located.
What is used to adjust the amount of light on a microscope?
IRIS DIAPHRAGM CONTROL
— A lever (or rotating disk) that adjusts the amount of light illuminating the slide.
Why is it called a compound light microscope?
The compound light microscope is
a tool containing two lenses, which magnify, and a variety of knobs used to move and focus the specimen
. Since it uses more than one lens, it is sometimes called the compound microscope in addition to being referred to as being a light microscope.
What are the application of light microscope?
Light microscopy is used to
make small structures and samples visible
by providing a magnified image of how they interact with visible light, e.g., their absorption, reflection and scattering.
Who used a compound microscope to see Chambers?
| Question Answer | Who used a compound microscope to see chamber within cork and named them cells? Robert Hooke | What advance in technology made the discovery of cells possible? the microscope | Which of the following is not a principle of the cell theory? very few cells are abble to reproduce |
|---|
