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Snaprevise A Level Biology - Microscopes > Light Microscopes > Flashcards

Light Microscopes Flashcards

1
Q

How far can the human eye distinguish things?

A

0.1mm apart - about the size of a human egg cell

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2
Q

What do biologists want to study?

A

Specimens that are much smaller - such as bacteria and red blood cells

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3
Q

What are eyes limited to?

A

Magnification and resolution

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4
Q

What do you have to do in order to look at biology more closely?

A

Increase our maximum magnification and resolution

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5
Q

What do different microscopes have?

A

They have different magnification and resolution

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6
Q

What does magnification describe?

A

How many times bigger an image gets when it is put under the microscope

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7
Q

What do the more powerful microscopes have?

A

Higher magnification

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8
Q

What is different to resolution?

A

Magnification

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9
Q

What does resolution describe?

A

How much fine detail we can see in the image

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10
Q

What is resolution?

A

The smallest distance that two objects can be apart whilst still appearing as two objects

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11
Q

Magnification is how many…

A

Times larger an image appears

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12
Q

What is the first and most common type of microscope?

A

Light microscope

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13
Q

What is sent from a light source through a specimen where the image of which is magnified by glass lenses?

A

Light

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14
Q

Why are light microscopes the most common type of microscopes?

A
  1. They are cheap to build and buy 2. They are easy to use 3. They can be used to study living cells - which not all microscopes have
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15
Q

What type of microscope shows a 2D image of living cells?

A

Light microscopes

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16
Q

What type of microscope uses visible light to create an image?

A

Light microscopes

17
Q

What is limited by visible light to create an image for a light microscope?

A

The resolution is limited to 200nm and magnification to x2000 than the actual object

18
Q

What type of microscope use a high power beam of light to create an image?

A

Laser scanning microscopes

19
Q

The laser passes over each point in the specimen and…

A

Creates an image over time

20
Q

What is more expensive than light microscopes, but have a high resolution?

A

Laser scanning microscopes

21
Q

What type of microscope can show specimens in 3 dimensions?

A

Laser scanning microscopes

22
Q

Why is it good how a laser scanning microscope can show specimens in 3 dimensions?

A

It is good to show how things work and how smaller specimens we cannot observe with our naked eye function

Snaprevise A Level Biology - Microscopes (4 decks)

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