Chapter 4 pt. 1

Question 1

Vision is basically your eyes absorbing _____

Answer 1

light

Question 2

The danger of radiation is dependent of its __________

Answer 2

properties

Question 3

True or False: not all radiation is dangerous

Answer 3

True

Question 4

Light is ___________ radiation, it travels in waves.

Answer 4

electromagnetic

Question 5

Light is electromagnetic radiation, it travels in ______.

Answer 5

waves

Question 6

Amplitude or Wavelength: the height of a light wave

Answer 6

amplitude

Question 7

Amplitude or Wavelength: the brightness of light

Answer 7

amplitude

Question 8

Amplitude or Wavelength: distance between peaks in light

Answer 8

wavelength

Question 9

Amplitude or Wavelength: Hue the color of the light

Answer 9

wavelength

Question 10

True or False: when it comes to light, the longer the wavelength the more dangerous it is

Answer 10

False, the shorter the wavelength the more dangerous it is

Question 11

True or False: the shorter the wavelength the more dangerous it is

Answer 11

True

Question 12

different wavelengths added together

Answer 12

purity

Question 13

The eye houses the _____ and channels light toward it

Answer 13

retina

Question 14

How does light enter the eye?

Answer 14

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…

Question 15

ring of muscle in the eye

Answer 15

iris

Question 16

______ size regulates the amount of light

Answer 16

pupil

Question 17

pupil size regulates the amount of ______

Answer 17

light

Question 18

the back of your eye that has cones

Answer 18

fovea

Question 19

How does nearsightedness occur?

Answer 19

• 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)

Question 20

How does farsightedness occur?

Answer 20

• The focus of light from close objects falls behind the retina.
• eye is like a squished circle

Question 21

the retina contains two types of receptors, _____ and ______

Answer 21

rods

cones

Question 22

Rods or cones: night vision (sensitive dim light)

Answer 22

rods

Question 23

Rods or cones: faster dark adaptation

Answer 23

rods

Question 24

Rods or cones: daylight vision and color vision (provide sharpness and detail in bright light)

Answer 24

cones

Question 25

Rods or cones: focused in fovea

Answer 25

cones

Question 26

Does your eye have more rods or cones?

Answer 26

rods

Question 27

How do visuals travel through the brain?

Answer 27

1. Retina 2. Optic Chiasm 3. Lateral geniculate nucleus (LGN) 4. Superior colliculus 5. Visual Cortex

Question 28

Explain the Trichromatic Theory.

Answer 28

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)

Question 29

Why does color blindness occur?

Answer 29

Usually only one or two types of color receptors are faulty – most commonly red & green

Question 30

Many people with color blindness still see what colors?

Answer 30

blue and yellow

Question 31

How does the Trichromatic help explain color blindness?

Answer 31

Since color blindness has to do with faulty color receptors, trichromatic theory suggests each cone has a different set of sensitivity. Suggesting color blindness has to do with either too much or too little visible wavelengths. Or the fault may be due to sensitivity.