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Life science > Microscopes > Flashcards

Microscopes Flashcards

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1
Q

Why is it a conventional unit of measurement?

A

Too large to measure

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2
Q

What is the unit of measurement?

A

Microns

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3
Q

How many microns in 1mm?

A

1000 microns

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4
Q

Define micrograph

A

Photograph of a specimen viewed under microscope

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5
Q

What does one measure cell in?

A

Milimetre

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6
Q

How do you convert mm into microns?

A

times by 1000

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7
Q

How do you convert microns into mm?

A

divide by 1000

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8
Q

Define microscope

A

Instrument that uses a lens or combination of lenses to produce magnified images of small objects

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9
Q

What does the microscope allow you to do?

A

Look at small things with the naked eye

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10
Q

Define magnifying lens

A

A piece of glass that is specifically curved to produce an enlarge image of object

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11
Q

What is a compound microscope?

A

More than one lens and light to view specimen

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12
Q

What is a electron microscope?

A

Beams of electrons

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13
Q

Define ocular lens

A

Lens that you look through to view enlarged object

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14
Q

What is another name for ocular lens?

A

eyepiece

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15
Q

How much does the ocular lens magnify by?

A

10x

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16
Q

What is the body tube?

A

Lens that magnify object. Passes light from head to eyepiece

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17
Q

What is the rotating head?

A

Contains mirrors, allows body tube to rotate 360 degrees

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18
Q

What is the rotating nosepiece?

A

Structure that rotates. One of three different lens to view specimen

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19
Q

Define objective lens

A

Lens closest to specimen

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19
Q

Define objective lens

A

Lens closest to specimen

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20
Q

How many objective lens are there?

A

Three that are attached to rotating nosepiece

21
Q

Label the three objective lens

A
  1. Low magnification (red) 40X
  2. Medium magnification (yellow) 10X
  3. High magnification (Blue) 4X 
22
Q

Which lens produces the most magnification?

A

Objective lens

23
Q

Define stage clamp/clip

A

Holds down the microscope slide into olace

24
Q

What is the diaphragm?

A

Adjust amount of might passing through microscope

25
Q

What type of dial is on the diaphragm?

A

Rotating and number dials

26
Q

What are number dials?

A

Relative amount of light passing

27
Q

What is the number for the highest light passing?

A

5

28
Q

What is the number for the lowest light passing?

A

1

29
Q

What is the condenser?

A

Focuses light into specimen. Condenses light

30
Q

What is the mirror?

A

Directs light up - light source illuminated

31
Q

What is the base?

A

Support lenses and stage. Supports microscopes which contain electronics

32
Q

Define stage

A

Platform slide is place on

33
Q

What does the stage contain?

A

Opening

34
Q

What is the opening on the stage used for?

A

Allow light to pass through specimen

35
Q

What is the arm?

A

Supports the lenses, mirrors and body tube

36
Q

What does the arm connect?

A

Body tube to base

37
Q

How do you carry the microscope?

A

One hand on arm and one on bade

38
Q

What does turning the fine focusing knob do?

A

Changes distance between stage and objective lens

39
Q

How fast should you make focus adjustments in the fine focusing knob?

A

Slowly

40
Q

What type of objective is the fine focusing knob?

A

High power objective

41
Q

What is the coarse fixing knob?

A

Trying knob changes distance between stage and objective lens quicjly

42
Q

What type of focus is the fine focus knob?

A

Clear focus

43
Q

What type of focus is the coarse focus knob?

A

Rich focus

44
Q

What type of power objective is the coarse focus knob?

A

Low power objective

45
Q

Define wet mouth slide

A

Glass slide holding a specimen suspended in a drop of water and with a cover slip

46
Q

How is the specimen seen on microscope?

A

Specimen placed in a drip of liquid on microscope slide

47
Q

What is the liquid used on a slide?

A

Water

48
Q

What may be added to water?

A

Dye

49
Q

Why would dye be added to water?

A

Stain cells/part to be visible

50
Q

Formula magnification of specimen

A

Magnification if ocular lens X magnification of objective lens

51
Q

Formula for actual size of cell

A

Measure length X 1000 divide by given magnification

Life science (14 decks)

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