Waves, Lenses, Microscopes Science Skills – Part 1 Safety & Mag

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.

Which lens is diverging light?

BDiverging 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=PL64DF1909345AF984

• 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?

Convex

Concave

Convex

Concave

Convex

Concave

“Get out of my cave.”

• Concavo-convex

• 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 concave?

• Concave Mirror

• Convex mirror

• 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_________?

• These eyeglasses are double_________?Concave

• Nearsighted

• Farsighted

• Which is nearsightedness, and which is far sightedness?

Farsightedness

Farsightedness Nearsightedness

• Is this person nearsighted or far sighted?

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• 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 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 a light microscope. – It lets you magnify images that light can pass

through. Uses a glass slide and cover slip.

through. Uses a glass slide and coverslip.

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-wet-mount-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.

Electron Microscopes.: Learn more at.. http://www.jic.ac.uk/microscopy/intro_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 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. 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.

• 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

Waves, Lenses, Microscopes Science Skills – Part 1 Safety & Mag

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