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Science > The Microscope > Flashcards

The Microscope Flashcards

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1
Q

What two structures are used to focus on the specimen?

A

Fine adjustment and coarse adjustment knob

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2
Q

Why do we never use the coarse adjustment knob on high power?

A

It can crack your slide

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3
Q

What happens if you use direct sunlight to illuminate your specimen?

A

You can damage your eyes

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4
Q

What are the objective lenses?

A

Low, medium and high power

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5
Q

What is the power of the low power objective lens?

A

4x

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6
Q

What is the power of the medium power lens?

A

10x

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7
Q

What is the power of the high power lens?

A

40x

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8
Q

What is the diameter of the field of view of low power?

A

4 mm

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9
Q

What is the diameter of the field of view under medium power?

A

1.5mm

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10
Q

What is the diameter of the field of view under high power?

A

0.4mm

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11
Q

How should you carry the microscope?

A

One hand gripping the arm, the other hand supporting the base

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12
Q

What are dry mounts for?

A

For objects that are not alive

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13
Q

What are the steps of a dry mount?

A
  • place specimen on a dry slide

- cover with a cover slip

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14
Q

What are wet mounts for?

A

They permet the object to be better seen

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15
Q

What are the steps for a wet mount?

A
  • place specimen on the slide
  • with eyedropper, Place one drop of water on the specimen
  • place cover slip at a 45° angle and let go
  • blot excess water with a pencil eraser
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16
Q

How do you find the total magnification?

A

Ocular lens x objective lens magnification

17
Q

How many micrometers are in one millimetre?

A

1000 micrometers in one millimetre

18
Q

How many millimetres in 1000 micrometers?

A

1 millimetre in 1000 micrometers

19
Q

How do you find the size of something under the microscope?

A

Diameter of the field of view
—————————————
Number of objects that fit across the diameter of field of view

20
Q

What happened to the diameter of the field of you as you move from low to high magnification?

A

The diameter of the field of view gets smaller

21
Q

Explain why the size of objects viewed under high-power is usually recorded in micrometres?

A

Millimetres are too large to measure the field of view. You need a smaller measurement which are micrometres

22
Q

Which magnification would be the best for looking at several objects at the same time?

A

The low-power objective lens because it has the lowest magnification and the largest field of view so you can see all objects at the same time

Science (4 decks)

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