Flashcards in Chapter 4 pt. 1 Deck (31)
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1
Vision is basically your eyes absorbing _____
light
2
The danger of radiation is dependent of its __________
properties
3
True or False: not all radiation is dangerous
True
4
Light is ___________ radiation, it travels in waves.
electromagnetic
5
Light is electromagnetic radiation, it travels in ______.
waves
6
Amplitude or Wavelength: the height of a light wave
amplitude
7
Amplitude or Wavelength: the brightness of light
amplitude
8
Amplitude or Wavelength: distance between peaks in light
wavelength
9
Amplitude or Wavelength: Hue the color of the light
wavelength
10
True or False: when it comes to light, the longer the wavelength the more dangerous it is
False, the shorter the wavelength the more dangerous it is
11
True or False: the shorter the wavelength the more dangerous it is
True
12
different wavelengths added together
purity
13
The eye houses the _____ and channels light toward it
retina
14
How does light enter the eye?
1. light enters your eye then...
2. ...to lens: focuses the light on the retina (back of the eye)...
3. …past the ciliary muscles...
4. …axons bundle together to form optic nerve, which goes to the brain...
15
ring of muscle in the eye
iris
16
______ size regulates the amount of light
pupil
17
pupil size regulates the amount of ______
light
18
the back of your eye that has cones
fovea
19
How does nearsightedness occur?
- the focus of light from distant objects falls a little short of the retina
- the eye is elongated, like an oval, so the image does not quite reach the retina (naturally)
20
How does farsightedness occur?
-The focus of light from close objects falls behind the retina.
- eye is like a squished circle
21
the retina contains two types of receptors, _____ and ______
rods
cones
22
Rods or cones: night vision (sensitive dim light)
rods
23
Rods or cones: faster dark adaptation
rods
24
Rods or cones: daylight vision and color vision (provide sharpness and detail in bright light)
cones
25
Rods or cones: focused in fovea
cones
26
Does your eye have more rods or cones?
rods
27
How do visuals travel through the brain?
1. Retina
2. Optic Chiasm
3. Lateral geniculate nucleus (LGN)
4. Superior colliculus
5. Visual Cortex
28
Explain the Trichromatic Theory.
We perceive color by comparing the responses of three types of cones,
- each of which is sensitive to a different part of the range of visible wavelengths (e.g. short, medium, or long)
29
Why does color blindness occur?
Usually only one or two types of color receptors are faulty – most commonly red & green
30
Many people with color blindness still see what colors?
blue and yellow
31
