Microscope Lens Systems Quiz

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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?

1,000 nm (1 µm) Signup and view all the answers

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

Measuring sizes using a microscope Signup and view all the answers

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

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

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

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

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

X400 total magnification Signup and view all the answers

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

Photomicrographs Signup and view all the answers

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

Brightfield microscope 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?

Darkfield microscope Signup and view all the answers

What is the resolving power of optical instruments related to?

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

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

X300 Signup and view all the answers

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

3-20 times larger Signup and view all the answers

How is a compound microscope different from a simple microscope?

Contains more than one magnifying lens Signup and view all the answers

What is the resolving power of a compound light microscope?

Approximately 0.2 µm Signup and view all the answers

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

Wavelength of visible light (~0.45 µm) Signup and view all the answers

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

1,000 times better Signup and view all the answers