Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Optics BLOCK 2 > Microscope/telescope > Flashcards

Microscope/telescope Flashcards

1
Q

microscope

A
  • 2 lens system

- real converging, inverted, magnified

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

total magnification of microscope

A

Mtot=M1 x M2 (essentially squared)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

image and rays at the eye piece

A

-the parallel rays NEVER converge, the image is at optical infinity, can not ray trace the image, virtual optical infinity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

final image through microscope

A

has magnification substantially more than 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

magnification of eye piece!!

A

Mep= 25cm/fe+1

eye piece is essentially a magnifying lens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

microscope magnification

A

M=M(objective) x M(eye piece) = (- L/f0) x (25cm/fe)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

resolution limit

A
  • how sharp/clear an image is
  • tell the difference between two points
  • minimum angle of resolution (MAR), the smaller the better!
  • expressed in angles or length
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

resolving power (ability)

A
  • 1/resolution
  • reciprocal of the resolution limit
  • LARGER is better
  • expressed in inverse angles, or inverse length
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what does resolution depend on?

A

wavelength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what can the human eye resolve

A

around 1 arcmin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

useful magnification

A
  • eye can only pick up so much
  • no sense in over magnifying if eye can’t pick it up
  • about 0.25m (near point)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what is a telescope?

A

two lens system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the image of the first lens in the telescope?

A

the object for the second lens.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the first lens in a telescope?

A

objective lens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what is the second lens in a telescope?

A

the eye piece

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the beam vergence of incoming rays in telescope?

A

collimated, 0 beam vergence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

what is the beam vergence of outgoing rays in a telescope?

A

collimated, 0 vergence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Where is the object located in telescope?

A

optical infinity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is the difference between the two collimated incoming/outgoing rays?

A

the incoming rays have a much larger diameter than the outgoing rays

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What does a telescope ultimately do?

A

condense large things into smaller rays of light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is the total optical power of a telescope?

A

0
-0 beam veregence coming in and going out
Po+Pe-(d/1)Po(Pe)=0

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

where are the principal planes of a telescope?

A

at infinity

23
Q

magnification of telescope

A

-microscope and the telescope are based on magnification of a magnified image, and thus the total magnification is the product of the two individual magnifications, the primary, from the objective lens, and the secondary from the eye piece

24
Q

What kind of vergence does a microscope have?

A

strong vergence

25
Q

what kind of vergence does a telescope have?

A

no vergence

26
Q

What do you observe with a microscope?

A

a near object

27
Q

what do you observe with a telescope?

A

distant object

28
Q

lens separation in a microscope

A

larger than the sum of the focal distances

29
Q

lens separation in a telescope

A

equal to sum of the focal distances

30
Q

what are the properties of an image seen through a microscope?

A

-magnified, inverted, dimmer

31
Q

what are the properties of an image seen through a telescope?

A
  • minified, inverted, brighter

- changes apparent angle in which we view the object

32
Q

is the telescope actually magnifying?

A
  • contrary to a microscope, the telescope lateral magnification is smaller than 1: we may observe a real image of the sun projected o a screen with a telescope
  • the image’s diamter is far smaller than that of the sun, and thus the lateral magnification is a very small number
  • this image, however is perhaps 20 to 50 times larger than what it would appear through the naked eye
33
Q

What sets the limit of resolution in any optical system?

A

-diffraction from circular aperature

34
Q

minimum angle of resolution

A

=(1.22 X wavelength)/(objective lens diameter)

35
Q

telescope resolution

A
  • we unsuccessfully observe a double star with a telescope (no double star resolution)
  • to improve resolution, we decide to employ a chromatic filter
  • You want the angle of resolution to be at it’s smallest, so put a blue filter on to make the angle smaller
36
Q

smaller angle of resolution…

A

larger objective lens diamter

37
Q

Why do some stars appear as 1, when there are acatually 2 or 3?

A

because the angle of resolution is so small you cannot differentiate

38
Q

What can the eye resolve?

A

about 1’

39
Q

what can a telescope resolve?

A

about 1”

40
Q

Kepler type telescope

A
  • astronomical
  • length of telescope is the focal length
  • two plus lenses
  • virtual image at optical infinity
  • d=Fo+Fe
41
Q

Galilei type telescope

A
  • terrestrial
  • low vision aids in optometry
  • erect image at optical infinity
  • d=Fo-Fe
42
Q

What lens has the biggest diameter in a kepler type telescope?

A

objective lens

43
Q

What lens has the biggest power in a kepler type telescope?

A

eye piece

44
Q

What is a problem with using a very large diameter lens?

A

weighgt, cost

45
Q

galilei type telescope and visual aid

A
  • erect shorter image

- 2 lenses, not fused, there is air between them

46
Q

newtonian refractor

A

defflector on side

47
Q

catadioptric telescopes

A

combo of mirrors and optics

48
Q

What is chromatic abberation related to?

A

refraction

49
Q

how many surfaces in reflecting telescopes?

A

1

50
Q

Where is the support needed in a reflecting telescope for the lens?

A

in the back

51
Q

why do stars twinkle?

A

the atmosphere is a nonuniform lens scattering the layers

52
Q

a telescope can only be as good as…

A

the atmospheric conditions

53
Q

adaptive optics

A

-atmospheric turbulence can cause distorted wavefront

Optics BLOCK 2 (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions