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66 Cards in this Set

  • Front
  • Back
what is the approx diameter of the eye
25 mm
Where does light enter the eye
The Cornea
What is the Cornea?
Where the light enters the eye
what does the Cornea cover?
The aqueous humor
what is the clear liquid region behind the cornea?
The aqueous humor
What is behind the lens?
The vitreous humor
What is the retina?
light sensitive part of the eye
what is the retina made up of?
Rods and Cones
What is the purpose of the optic nerve?
Sends electial impulses to the brain
What is the importance of the brain?
interprets the image on the retina
What is the colored Portion of the eye?
the Iris
What is the purpose of the iris?
acts as a controller because it has a variable opening through which light passes
What is the opening through which light passes called?
the pupil
The diamter of the pupil ____in bright light
decreases
the diameter of the pupil ____in low light
increases
what is the shape of the lens altered by?
The cillary muscle
how is the lens connected to the cillary muscle?
suspensory ligaments
1
Cornea
2
Aqueous humor
2
Aqueous humor
3
Lens
4
Iris
5
Cillary Muscle
6
suspensory ligament
7
Vitreous Humor
8
Retina
9
optic nerve
What is the image formed on the retina
real, inverted, and smaller
What is fixed, Do, Di, or f?
Di
what adjusts the focal length of the lens in the eye?
the ciliary muscles
when an eye looks at a distant object, the ciliary muscle is..
relaxed
when the eye looks at a near object the ciliary muscle is
tense
when the eye is relaxed, is it at its most or least curvature?
least
when the eye is relaxed it the focal length longer or shorter?
longer
what makes it possible for the eye to focus on different distances?
accomodation
what is the closest point at which your eye can see clear objects
the near point
at what point is the eye fully relaxed
the far point
what is the approx far point
infinity
what is the approximate near point
25 cm
What does nearsighted mean?
People can only focus on near things and far things are blurry
For nearsighted people, f is....
too short
where does the image of a nearsighted person appear?
infront of the retina
nearsightedness can be corrected using....
diverging lenses
What can a farsighted person see
things that are faraway, but can't focus on things that are close
what kind of lens is used to correct farsightedness
converging
for a converging lense f is...
+
what color of light bends the most?
violet
What color of light bends the least?
red
what is the middle callled on fiberoptic cables?
core
what is the outside called in fiberoptic cables?
cladding
total internal reflection occurs only.....
when going from a higher n to a lower n
what is the formula for n?
speed of light in a vacuum (c)/ speed of light in material (v)
what is snell's law?
n1Sin1=n2Sin2
What are the tpes of converging lenses
Double convex, convex meniscus, plano-convex
what are the three types of diverging lenses?
Double concave, Plano-concave, concave meniscus
what sign is f for a converging lens?
+
what sign is f for a diverging lens?
-
when drawing ray diagrams, the objct is always on the ______of the lens?
left
when is Do +
when the object is on the left of the lens
when is Do -
if the object is on the right of the lens
what does it mean when Di is +
real image
what does it mean when Di is -
Virtual image
what side of the lens is Di +
left
what side of the lens is Di -
left
For a farsighted person, glasses bend light
away from the principal axis
For a nearsighted person, glasses bend light
toward the principle axis