Pupils And Stops And Related Effects 2 Flashcards
Field lens
- A plus thin lens that is added to a system to eliminate vignetting
- it increases with field of uniform illumination and the field of half illumination
- images the second lens at the same location as the first lens. It is places at the internal real image position
Please for the love of god do some practice problems
Pupil matching
-maximizes the light getting through multiple optical systems by placing the entrance pupil of a second optical system with the exit pupil of the first pupil
Please for the love of god do some practice problems
Virtual reality field of view
80 degrees
Please for the love of god do some practice problems
Virtual reality eye relief
18mm
Please for the love of god do some practice problems
Virtual reality lens diameter
34mm
Please for the love of god do some practice problems
Virtual reality lens focal distance
37.3mm
Please for the love of god do some practice problems
Virtual reality PD
64mm
Please for the love of god do some practice problems
Keplarian telescope lenses
Objective lens +
Ocular lens +
Keplarian telescope image
Magnified and inverted
Focal point of objective lens is ON the focal point of eye piece
Ramsden circle
- exit pupil of kep telescope
- image of the objective lens by the ocular lens
- real image
- important designs of the kep telescope
How do you calculate exit pupil (Ramsden) from magnification and diameter?
Objective lens diameter/magnification
8 times mag
40 mm diameter
8X40
40/8=5mm
Larger objective…
Provides greater light and better resolution
Galilean telescope lenses
Objective +
Ocular lens -
What is the field of view limited by in the galilean telescope?
The objective lens
WHat is the field of view maximized by in the Galilean telescope?
Getting as close as possible to the ocular lens
Exit pupil of galilean telescope
Virtual image (inside the telescope)
Pupil matching in galilean telescope
Cannot get pupil matching
Stimulus variables affecting pupil size
- light level
- spectral composition
- spatial configurations (field size)
- monocular/binocular view
- accommodative state
- non-visual stimuli (pain, noise)
Observer variables affecting pupil size
- individual differences
- age
- day-to-day within observer variance
- biomechanical factors (respiration and heart beat)
- cognitive factors (arousal/attention/fright, workload, hedonistic content)
What is the pupil perfectly located for?
To maximize the field of view of the eye
1/2 illumination field of view
Angle sub tended from the center of the entrance pupil to the edges of the field stop
How doe eye perceive light?
On a logarithmic scale
What is most responsible for how the eye reacts to light?
The retina
