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Types of Microscopes

# Types of Microscopes

### Types of Microscopes

In modern times we have developed technologies to be able to see structures of cells in greater detail through microscopy.

1

This is a microscope

It uses lenses and mirrors to produce images of very small things, like cells, so you can see them.

2

A microscope "magnifies" things, so it makes things look __________.

A) bigger B) smaller C) more detailed

3

The image that a microscope produce will have a certain "resolution". The higher the resolution, the __________ detailed the image will be.

A) more B) less

4

Magnification and resolution

Magnification means to make things look bigger. Resolution is about how fine the detail in the image is.

1

This is a compound microscope. How many sets of lenses does it have?

2

The objective lens and the eye piece lens work together

It was the Dutch that worked out that two lenses together could magnify an image better than a single lens alone, already in 1590!

3

What is the magnification of the objective lens here?

4

What is the magnification of the eye piece lens here?

5

The overall magnification is $\times 300$, so you work out the overall magnification by ____________ the magnification of each of the lenses.

1

What is the overall magnification here?

1

How much does the eye-piece lens magnify this image?

1

This microscope uses a light source

Today, light microscopes can magnify up to $\times 1,500$

2

Magnification of $\times 1,500$ means we can examine the details of the structures inside cells. With one word, these structures are called _____________.

1

This is the inside of an electron microscope

It uses beams of electrons to produce the image - it doesn't use light.

2

Electron microscopes can make things look a lot bigger than light microscopes so they allow for higher ____________.

A) magnification B) resolution

3

An electron microscope can magnify $\times 1,000,000$!

Compare that to a light microscope that can't really magnify any more than $\times 1,500$

4

Electron microscopes can also produce images in much finer detail than light microscopes, so they have much higher ____________.

A) magnification B) resolution

5

Electrons can tell objects apart that are only 1 nanometre from each other. How much is that in metres?

A) One thousandth of a metre B) One billionth of a metre C) One trillionth of a metre

6

So electrons can tell objects apart that are only 1 billionth of a metre, $1 \space nm$, from each other!

Compare that to a good light microscope that needs objects to be $200 \space nm$ from each other to be able to tell them apart.

7

However!

The samples for electron microscopes have to be placed in a vacuum, and some need to be plated in gold.

This means you can't examine living samples under an electron microscope.

Pick all the correct options you think are correct: The advances in compound and electron microscopes have improved our ability to...

1

Summary! Magnification and resolution

Magnification means to make things look bigger. Resolution is about how fine the detail in the image is.

2

Compound microscopes use two sets of lenses

You work out the overall magnification by multiplying the magnification of each of the lenses.

For example, if the objective lens magnifies $\times 30$ and the eye piece lens magnifies $\times 10$, then the overall magnification is $\times 300$

3

Light microscopes

Can magnify up to $\times 1,500$ They can tell things apart that are $200 \space nm$ from each other.

4

Electron microscopes

Can magnify $\times 1,000,000$ They can tell things apart that are just $1 \space nm$ from each other.

5

However!

You cannot examine living samples under an electron microscope, because the samples have to be in a vacuum. Some even have to be plated in gold.