grade 8 science unit 2: optics - lushman's...
TRANSCRIPT
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Grade 8 Science
Unit 2: Optics
Chapter 6:
Lenses refract light to form images.
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Lenses
A curved piece of
transparent material that
refracts light in a
predictable way.
Usually made from glass or
plastic.
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Lense
s
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There are two types of lenses:
1. Convex
Centre of the lens bulges out
Causes light rays to bend toward each other (converge)
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2. Concave
Centre of the lens is curved
in
Causes light rays to bend
away from each other
(diverge)
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Conve
x v
s. C
onca
ve L
ense
s
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Convex Lenses
Can act as a magnifying
glass
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Corrective Lenses
The Eye (pg. 229)
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Vis
ion
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Near-sighted Vision
See objects up close but
not at a distance.
Concave lenses are used to
correct this vision.
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Near
- si
ghte
d V
isio
n
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Far-sighted Vision
See objects at a distance
but not up close.
Convex lenses are used to
correct this vision.
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Far
-sig
hte
d V
isio
n
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CORE
STSE:
“Fibre
Optics” Fibre Cable
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Optical Technologies...
1. Microscopes
Uses two convex lenses
with relatively short focal
points to magnify
Magnified twice to
increase enlargement
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The M
icro
scope
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2. Telescopes
The objective lens has a
longer focal length than the
microscope.
Can have either a refracting
or reflecting telescope
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Refracting Telescope (pg. 245)
The lenses bend light to
focus it.
The objective lens must be
as large as possible to view
distant galaxies (makes it
heavy)
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Reflecting Telescope (pg. 246)
Uses a concave mirror, plane mirror and a convex lens to collect and focus light from objects at a great distance.
Most large telescopes are this type.
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The Hubble Space Telescope
Launched in 1990
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The Reflecting
Telescope
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3. Cameras (pg. 248)
4. Binoculars (pg. 247)
5. Face shields
6. Magnifying glasses
7. Contact lenses
8. Flashlights
9. Eye glasses
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The Nature of Science
The development of new technologies involve many individuals and groups of people.
These technologies can alter what we know about the nature of science.
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1602
1672
Individuals...
Galileo
Newton
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Groups...