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Optics Block 3 > Week 1 > Flashcards

Week 1 Flashcards

1
Q

Name the sets of images we talk about when we discuss field of view

A
  1. Field of uniform illumination
  2. “Field of view” (at least 1/2 illumination)
  3. Total field of view
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2
Q

Field of uniform illumination

A

Set of image points with the same illumination passing through the system

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3
Q

What rays determine the field of uniform illumination?

A 
Chief Ray (points towards the center of the entrance pupil) 
Marginal Ray( Ray that just passes the edge of the aperture stop)
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4
Q

Field of at least one half illumination

A

-field of view without specifications refers to this

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5
Q

What rays determine the field of at least one half illumination?

A
  1. Chief Ray

2. Ray from the edge of the field stop to the center of the aperture stop

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6
Q

Total field of view

A

-from zero to full illumination

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7
Q

What rays determine the total field of view?

A
  1. Chief Ray

2. Ray that passes from top edge of field stop to bottom edge of aperture stop

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8
Q

Eye relief

A

The distance from the last surface of an eye piece at which the users eye can obtain the full viewing angle
- the exit pupil of the system matches up with the entrance pupil of your eye would be the minimum

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9
Q

Eye relief trends

A
  • if the eye is outside the distance (too forward or too far back) a reduced field of view will be obtained
  • the higher the magnification, the shorter the eye relief
  • the larger the intended field of view, the shorter the eye relief
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10
Q

Vignetting

A

-fall off in illumination for points away from the optical axis

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11
Q

Vignetting trends

A
  • if eye relief is too short and you cannot get your eye close enough, vignetting will occur
  • the larger the distance between the edge of full illumination and the bottom of the total field, the larger the vignetting
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12
Q

Can you wear glasses and use binoculars?

A

-if the lens is not super strong(so the eye relief is longer) glasses can be worn and vignetting will not occur

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13
Q

Field lens

A
  • a plus thin lens that is added to a system to eliminate vignetting
  • increases the field of uniform illumination and filed of half illumination
  • images the second lens at the same location as the fist lens.
  • places at internal real image position
  • matches the field views of the lenses
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14
Q

Pupil matching

A

-maximizes the light getting through the multiple optical system by placing the ENTRANCE PUPIL of SECOND optical system with the EXIT PUPIL of FIRST pupil.

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15
Q

What do virtual reality viewers do?

A

The lens cuts down the field of view

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16
Q

Keplerian telescope

A
  • plus objective lens and plus ocular lens

- image is magnified and inverted (looking through the ocular side)

17
Q

Keplarian exit pupil

A
  • ramsden circle or eye ring
  • image of the objective lens by the ocular lens
  • real image
18
Q

Markings on binoculars (8X40)

A

-magnification X diameter of objective lens(mm)

19
Q

How do you determine the size of the ramsden circle?

A

Divide diameter of objective lens(mm) by magnification

20
Q

The larger the objective lens…

A

The greater the light (brighter)

21
Q

Galilean telescope

A

Plus objective lens and MINUS ocular lens

  • field of view is limited by OBJECTIVE LENS
  • field of view is maximized by GETTING AS CLOSE AS POSSIBLE TO THE OCULAR LENS
  • exit pupil is a VIRTUAL image
22
Q

Can Galilean telescope obtain pupil matching?

A

NO!

-the exit pupil is inside the telescope so you cannot get the entrance pupil of your eye to it

23
Q

Stimulus variables of pupil size

A
  • light level
  • special configuration
  • accommodative state
  • pain/noise
24
Q

Observer variables of pupil size

A
  • individual differences
  • age
  • day to day changes
  • respiration and heart beat
  • fright, work load
25
Q

The pupil is located for the position to

A

It maximizes the field of view

-cornea has an extremely wide field of view

26
Q

Environment light

A
  • range is enormous

- on log scale so if surface radiance increases by 10 times, it only appears twice as bright

27
Q

Retina and light perception

A

-the retina really does all the work, pupil doesn’t really do that much.

28
Q

Exposure

A

Amount of luminous flux (light energy) delivered to a film

Optics Block 3 (2 decks)

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