Midterm Flashcards
(26 cards)
Why does the sculpture in this video (photos below) look like a picture of an eye on a flat surface (bottom photo), even though it’s a 3D array of black balls hanging from the ceiling?
Bet on the familiar/non-accidental
An observer sitting in a camera obscura sees an image and notices there is very little, if any, color. The most direct and likely explanation for this particular observation is:
It’s a scotopic situation.
Staring at some blurry colored dots, you notice they disappear. This is because of _______ and is an example of the principle of ______ Then, when you move your eyes, the colors are _______.
- 3.
psychophysics
relate a physical stimulus with a psychological state
autocalibration
eye calibrates to environment
Name two examples of autocalibration
- vision from night to day
- motion auto-calibration
measure then model
spare information can give rise to strong percepts
Name an example of measure then model & replace ambiguity with certainty
a bunch of dots can appear like a person walking
replace ambiguity with certainty
strong percepts exist because when given ambiguous information, the brain goes with the familiar
Name an example of bet on the familiar or non-accidental
3D perception of 2D pictures
Many different 3D objects have same 2D silhouette, how can we interpret?
Measure, try to model, solve ambiguity, select most common
Name an example of most common interpretation
when looking at a cube, you can perceive vertex as close or far from you
Where does sunlight fall on the electromagnetic spectrum?
between UV rays and infrared rays
How does light travel?
in a straight line as an electromagnetic wave
Why can we see objects?
light reflects in every direction from each point of an object
Name the 4 ways to recover a light pattern
- tubes
- pinhole
- mirror
- lens
tubes
imagine group of straws → light can go down tubes but cannot cross; one ray of light = one tube
pinhole camera
small pinhole allows for one direction of light per point
What is a limitation of pinhole cameras?
not enough light
lenses
light bends when crossing boundary between two materials, refraction proportional to ratio of speeds (think of sand trap example!)
What do converging prisms do?
sum light from all the rays
Explain focal point in lenses
- Distance from focal point is f
- Measured in diopters = 1/f
A powerful lens has a large or small f?
small
How does water affect f?
- lengthens it
- weaker f
