Microscope Lens Systems Quiz
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Questions and Answers

What unit of measure is commonly used to express the sizes of viruses?

nanometers (nm)

How small is a nanometer in relation to a meter?

one billionth of a meter

What is the size range of most viruses that cause human diseases?

10 nm to 300 nm

What is the size of Ebola viruses in nanometers?

<p>1,000 nm (1 µm)</p> Signup and view all the answers

What is the function of an ocular micrometer when measuring the sizes of microorganisms?

<p>Measuring sizes using a microscope</p> Signup and view all the answers

What is the resolving power or resolution of an optical instrument?

<p>the limit as to what can be seen using that instrument</p> Signup and view all the answers

What is the formula to calculate the total magnification of a compound microscope?

<p>Multiply the magnifying power of the ocular lens by the magnifying power of the objective lens being used.</p> Signup and view all the answers

What is the total magnification when using a X10 ocular lens with a X40 objective lens?

<p>X400 total magnification</p> Signup and view all the answers

What are photographs taken through the lens system of a compound light microscope called?

<p>Photomicrographs</p> Signup and view all the answers

What is a compound light microscope sometimes referred to when objects are observed against a bright background?

<p>Brightfield microscope</p> Signup and view all the answers

What type of microscope is it called when the condenser is replaced with a darkfield condenser and objects are seen against a dark background?

<p>Darkfield microscope</p> Signup and view all the answers

What is the resolving power of optical instruments related to?

<p>The ability to distinguish two points that are close together</p> Signup and view all the answers

What is the maximum magnifying power of Leeuwenhoek's simple microscopes?

<p>X300</p> Signup and view all the answers

What is the magnification range when using a magnifying glass as a simple microscope?

<p>3-20 times larger</p> Signup and view all the answers

How is a compound microscope different from a simple microscope?

<p>Contains more than one magnifying lens</p> Signup and view all the answers

What is the resolving power of a compound light microscope?

<p>Approximately 0.2 µm</p> Signup and view all the answers

What limits the size of objects that can be seen through a compound light microscope?

<p>Wavelength of visible light (~0.45 µm)</p> Signup and view all the answers

What is the resolving power of optical instruments compared to the unaided human eye?

<p>1,000 times better</p> Signup and view all the answers

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