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Optics BLOCK 2 > Pupils and Stops And Related Effects > Flashcards

Pupils and Stops And Related Effects Flashcards

1
Q

Field of view

A
  • the extent of the object plane that is imaged by the system
  • conventional field of view
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2
Q

What happens to the field of view as you move closer?

A

It becomes larger

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3
Q

How is the field of view measured

A
  • linear size in the object plane or image plane
  • measured as an angle
  • commonly measured as the angle of half of illumination
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4
Q

Angle of half illumination

A

Half of the light available gets to the field of view

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5
Q

How does a minus lens affect field of view?

A
  • smaller objects

- bigger field of view

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6
Q

How does a plug lens affect the field of view?

A
  • larger objects

- smaller field of view

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7
Q

Trends in field of view

A
  1. a minus lens will increase the field of view by minifying the image
  2. A plus lens will decrease the field of view by magnifying the image
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8
Q

Image space field of view

A
  • the limits to the linear field of view a expressed in image space
  • a 16’ giraffe looks like it’s 3 inches
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9
Q

What is the field of view is determined by two apertures of the optical systems

A
  • aperture stop

- field stop

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10
Q

Aperature

A
  • opening through which light travels
  • structure associated with that opening
  • diameter of the opening
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11
Q

Stop

A

-the physical entity that restricts the light

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12
Q

Object space

A

Where the light rays are coming from

Not always on the left

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13
Q

Image space

A

Where the image is

Not always on the right

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14
Q

Aperture stop

A
  • the physical entity that is most effective at limiting the amount of light that passes through the system
  • system reversible
  • same structure regardless of the direction of light (when collimated)
  • could vary with the distance of object
  • if the object is a near object and light is not parallel, the aperture is determined by the smallest angle
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15
Q

Entrance pupil

A
  • image of the aperture by any lenses in front of it

- image of the aperture stop as seen from the object side

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16
Q

Entrance pupil of the eye

A
  • virtual image of the iris that is magnified and appears further from the cornea
  • if it’s further from cornea…it’ll be magnified
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17
Q

Exit pupil

A
  • image of the aperture stop as seen from the image side
  • the exit pupil is the image of the aperture stop formed by any lenses behind it-exit pupil of the eye is a virtual image of the iris that is magnified and appears further from the retina
18
Q

Field stop

A

The physical entity that is most effective at limiting the field of view together with the aperture stop

19
Q

How do you find the field stop?

A

You find the aperture stop and then start in the middle of that and find the smallest angle
-for the natural pupil, the field stop is the outside aperture that limits the field of view

20
Q

Entrance port

A
  • image of the field stop as seen front he object side

- the entrance port is the image of the field stop by any lenses in front of it

21
Q

Exit port

A
  • image of the field stop as seen from the image side

- it is the image of the field stop formed by any lenses behind it

22
Q

Marginal ray

A

The ray that just passes the edge of the aperture stop

2

23
Q

Chief ray

A

The ray from an object point that is incident on the system pointing towards the center of the entrance pupil

24
Q

What does chief ray determine

A

Blurred image size

25
Q

What happens to an image as it blurs

A

It’s larger

26
Q

What does aperture stop do?

A

Limits light through the system

27
Q

Chief ray determines what?

A

Approximate height of blurrred image

28
Q

What does the size of aperture stop determine?

A

Magnitude of blur

29
Q

Why do marginal rays determine magnitude of blur?

A

They are linked to the size of the aperture stop

30
Q

Increasing size of aperture stop

A

Increase blur

31
Q

Secreting size of aperture stop

A

Decrease blur

32
Q

Smaller pupils

A

Reduce blur

33
Q

Larger pupils

A

Increase blur

34
Q

Blur

A

defocus x pupil size

35
Q

Characteristics of keplarian telescope

A
  • large colimated lights coming in
  • small collimated lights leaving
  • a plus lens and a minus lens
36
Q

Primary focal point of a convex lens

A
  • negative

- light has to come out of that point and then collimate when it hits the light

37
Q

Near point of emmetropes with 4D of accommodation

A

-25cm

38
Q

Far point of myope

A

In front of eye

39
Q

Far point of hyperope

A

Behind eye

40
Q

Far point for emmetrop

A

Infinity

41
Q

What spectacle RX if 50cm in front of eye is the far point?

A

-2.00D myope

42
Q

What creates the field of view?

A

Aperture stop and field stop

Optics BLOCK 2 (8 decks)

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