Waves, Lenses, Microscopes
Science Skills – Part 1 Safety & Mag
• Wave interference.
• Ripple tank simulator.
• http://www.falstad.com/ripple/
• Identify some properties of waves, include
reflection, interference and diffraction
(refraction?).
• Lens: A transparent optical device used to
converge or diverge transmitted light.
• Lens: A transparent optical device used to
converge or diverge transmitted light.
Which lens is diverging light?
• Lens: A transparent optical device used to
converge or diverge transmitted light.
Diverging Light
• Lens: A transparent optical device used to
converge or diverge transmitted light.
Diverging Light
• Lens: A transparent optical device used to
converge or diverge transmitted light.
Converging light
• Lens: A transparent optical device used to
converge or diverge transmitted light.
Converging light
• Please sketch the following.
– Please use a straight edge.
– Complete diagrams of both from the videos.
• Video Link! Concave and Convex Lens
– http://www.youtube.com/watch?v=DPvvjjnKs4k&feat
ure=results_main&playnext=1&list=PL64DF1909345AF
984
• Video Link! Ray Box and Optics.
– http://www.youtube.com/watch?v=8gyGfiiC3ms
&feature=related
• Activity Simulator:
• http://phet.colorado.edu/en/simulation/geom
etric-optics
• Activity! Converging light sketch / lens
– http://www.youtube.com/watch?v=BrNB_BacIkA
&feature=related
– Sketch this starting template (double convex)
• Activity! Diverging light sketch / lens
– http://www.youtube.com/watch?v=8fUygzGO3b4&fe
ature=related
– Sketch this starting template (double concave)
Which lens is converging light?
Which lens is converging light?
Convex
Convex
Concave
Convex
Concave
Convex
Concave
“Get out of
my cave.”
• Concavo-convex
• Concavo-convex
• Which a concave polygon?
• Which a concave polygon?
• Which a concave polygon?
Learn more about light, optics, and lenses at:
lhttp://www.nightlase.com.au/education/optics/lenses.htm
• Which is double convex?
• Which is double convex?
• Which is double concave?
• Concave Mirror
• Convex mirror
• Which mirror is convex, and which mirror is
concave?
• Which mirror is convex, and which mirror is
concave?
• Which mirror is convex, and which mirror is
concave?
• Which mirror is convex, and which mirror is
concave?
• Which mirror is convex, and which mirror is
concave?
• For those who wear eyeglasses, the shape of
the lens in the eye glasses help to correct the
focus point.
• These eyeglasses are double_________?
Concave
• These eyeglasses are double_________?
Concave
• These eyeglasses are double_________?
• Nearsighted
• Nearsighted
• Farsighted
• Farsighted
• Which is nearsightedness, and which is far
sightedness?
Farsightedness
Farsightedness
Nearsightedness
Farsightedness
Nearsightedness
• Is this person nearsighted or far sighted?
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• Answer! Farsighted
• Answer! Farsighted
• Activity! Vision test. Second from the bottom
row from the back of the room.
• Hubble Space Telescope.
• Activity! Lens Optics Simulation
– http://phet.colorado.edu/en/simulation/geometric-optics
• Which microscope should be used to view a
bumble bee, living cell, and deep into a dead
cell?
• Which microscope should be used to view a
bumble bee, living cell, and deep into a dead
cell?
• Which microscope should be used to view a
bumble bee, living cell, and deep into a dead
cell?
• Which microscope should be used to view a
bumble bee, living cell, and deep into a dead
cell?
• Which microscope should be used to view a
bumble bee, living cell, and deep into a dead
cell?
• Which microscope should be used to view a
bumble bee, living cell, and deep into a dead
cell?
• Which microscope should be used to view a
bumble bee, living cell, and deep into a dead
cell?
• Which device should we use to look at the
specimen on the left?
• The device in the middle, called a stereoscope
is used for large objects?
• Which device should we use to look at the
specimen on the left?
• The microscope on the right is a compound light
microscope and is used for very small specimens
that light can pass through.
• This is stereoscopic microscope.
• It looks at things in which light cannot pass like
a bumble bee.
– Lets you see the image in 3D.
• This is stereoscopic microscope.
• It looks at things in which light cannot pass like
a bumble bee.
– Lets you see the image in 3D.
• This is stereoscopic microscope.
• It looks at things in which light cannot pass like
a bumble bee.
– Lets you see the image in 3D.
• This is a light microscope.
– It lets you magnify images that light can pass
through. Uses a glass slide and cover slip.
• This is a light microscope.
– It lets you magnify images that light can pass
through. Uses a glass slide and cover slip.
• This is a light microscope.
– It lets you magnify images that light can pass
through. Uses a glass slide and coverslip.
Glass Slide
Glass Slide
Coverslip
Glass Slide
Coverslip
Drop of water
for a wet mount
slide.
Glass Slide
Coverslip
Drop of water
for a wet mount
slide.
Learn more about wet mount slides, oil immersion, and more
at…
http://www.microbehunter.com/2010/08/13/making-a-wetmount-microscope-slide/
• You do not put large objects under a light
microscope such as a rock, pencil, finger, etc.
• You do not put large objects under a light
microscope such as a rock, pencil, finger, etc.
– Specimens need to be incredibly thin and light
must pass through.
• You do not put large objects under a light
microscope such as a rock, pencil, finger, etc.
– Specimens need to be incredibly thin and light
must pass through. Uses Slides!
• This is an electron microscope.
• This is an electron microscope. It can magnify
specimens much smaller than a light, or
stereoscope,
• This is an electron microscope. It can magnify
specimens much smaller than a light, or
stereoscope, but doesn’t usually view live cells
or specimens.
• This is an electron microscope. It can magnify
specimens much smaller than a light, or
stereoscope, but doesn’t usually view live cells
or specimens.
Electron
Microscopes.:
Learn more at..
http://www.jic.ac.
uk/microscopy/intr
o_em.html
• Scanning electron microscope.
– Lets you see small specimens in 3-D.
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• Video! A look at the atoms in steel. Look closely
.
– http://www.youtube.com/watch?v=dNvdrpEmS48
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• Head of a flea under an electron microscope.
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• What is this a picture of?
– Hint, It’s on your homework.
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• What is this a picture of?
– Hint, It’s on your homework.
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• What is this a picture of?
– Hint, It’s on your homework.
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• What is this a picture of? Hint, It’s on your
lunch?
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• What is this a picture of? Hint, It’s on your
lunch? Grain of Table Salt.
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• What is this a picture of? Hint- It may be on
your person.
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• What is this a picture of? Hint- It may be on
your person.
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• What is this a picture of? Hint- It may be on
your person.
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• What is this a picture of? Hint- It may be on
your person. Answer: Velcro
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• Mascara brush.
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• Diatom (Protista) Shell made of glass.
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• Cross section of a leaf.
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• Clam gills.
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• Eye of a fruit fly.
• Eye of a fruit fly.
• Variety of Pollen Grains.
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• Human hair.
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• Toilet Paper
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• Electric Guitar String.
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• Nylon stockings.
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• Microorganisms on a sheet of paper.
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Head
of
Tick
• Aquatic skin parasites on fish.
• Reptile Scales.
• Microscopic Spider.
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• Dust mite.
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• Dust mite. If you are allergic to dust, it is most
likely the feces of the dust mite.
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• Dust mite. If you are allergic to dust, it is most
likely the feces of the dust mite.
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• Porcupine quill.
• Claw of Black Widow Spider
• Video! (Optional) More Magnified Images.
– http://www.youtube.com/watch?v=SIOOLXbwWME