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Lecture

PHYS 1041 Lecture Notes - Vitreous Body, Aqueous Humour, Optical Power

2 Pages
70 Views
Winter 2014

Department
Physics
Course Code
PHYS 1041
Professor
Dr.David Fleming

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Physics 1041
Notes
April 2nd
Human eye:
composed of lens, cornea, iris, and filled with aqueous humour and vitreous
humour
shape of lens changes with focus; bends to focus near, flattens to focus far
lens hardens and bends less with age, becomes more difficult to see things that are
near
the eye forms an inverted image, which is flipped to upright by the brain
signals are sent from the optic nerve to the brain when light signals are received in
the retina by photoreceptors
Corrective lenses:
near-sightedness: light focuses before the retina, and the person is unable to focus
on far objects. Solution: a diverging lens to bring light backwards to the retina
far-sightedness: light focuses past the retina, and the person is unable to focus on
near objects. Solution: a converging lens to bring light forward to the retina
the key parameter for lenses is the focal length
focal length is given as the inverse of the optical power, measured in Diopters,
which are the inverse of a meter
f
P1
=
April 4th
Human eye cont'd:
a blind spot exists in humans where the optic nerve joins the retina
there are no photoreceptors in this area
photoreceptors exist as two types; rods and cones
rod cells are used in faint, dark conditions, and are the most predominant in the
retina
cone cells are used to register colour, and work best in bright light, these are less
common in the retina
Physical Optics:
the phenomena where the wave nature of light dominates
when light hits open slits in a material, it will generate a wave pattern on the other
side
interference occurs when two light waves come into contact
constructive interference: when 2 light waves of equal wavelength and amplitude
that are perfectly in sync come together, the amplitude doubles. This causes a
"bright spot"

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Description
Physics 1041 Notes April 2nd Human eye: • composed of lens, cornea, iris, and filled with aqueous humour and vitreous humour • shape of lens changes with focus; bends to focus near, flattens to focus far • lens hardens and bends less with age, becomes more difficult to see things that are near • the eye forms an inverted image, which is flipped to upright by the brain • signals are sent from the optic nerve to the brain when light signals are received in the retina by photoreceptors Corrective lenses: • near-sightedness: light focuses before the retina, and the person is unable to focus on far objects. Solution: a diverging lens to bring light backwards to the retina • far-sightedness: light focuses past the retina, and the person is unable to focus on near objects. Solution: a converging lens to bring light forward to the retina • the key parameter for lenses is the focal length • focal length is given as the inverse of the optical power, measured in Diopters, which are the inverse of a meter P = 1 f April 4th Human eye cont'd: • a blind spot exists in humans where the optic nerve joins the retina • there are no photoreceptors in this area • p
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