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The Birth of the Light Microscope

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Questions and Answers

What was the result of Z.Janssen and his son Hans' experiment with lenses in a tube?

Nearby objects appeared greatly enlarged (correct)

They discovered bacteria

They observed the circulation of blood corpuscles in capillaries

They created the first telescope

Who is credited with making a much better instrument with a focusing device?

Robert Hook

Charles A.Spencer

Galileo (correct)

Anton van Leeuwenhoek

What achievement is attributed to Anton van Leeuwenhoek?

He was the first to see and describe bacteria, yeast plants, and the circulation of blood corpuscles in capillaries (correct)

He founded the industry of manufacturing fine optical equipment

He discovered the principles of lenses

He created the first telescope

Who reconfirmed Anton van Leeuwenhoek's discoveries of the existence of tiny living organisms in a drop of water?

Robert Hook Signup and view all the answers

When did several European countries begin to manufacture fine optical equipment?

In the middle of the 19th century Signup and view all the answers

What is the maximum magnification of present day instruments with blue light?

Up to 5000 diameters Signup and view all the answers

What is the limitation of a light microscope?

It cannot distinguish objects smaller than half the wavelength of light Signup and view all the answers

What is the purpose of the condenser lens in a microscope?

To focus light onto the specimen Signup and view all the answers

Where is the real image formed in a microscope?

By the objective lens Signup and view all the answers

What is the total magnification of a microscope?

The product of the magnification of the objective lens and the ocular lens Signup and view all the answers

What is the purpose of the ocular lens in a microscope?

To magnify the real image formed by the objective lens Signup and view all the answers

Why do scientists need to bypass light altogether to see tiny particles under a microscope?

Because light has a wavelength that is too large Signup and view all the answers