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Lens Technologies
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Microscopes
Invented by Johannes and Zacharias Jansen in 1590
Larger inverted image
Used in study of cells and diseases
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Refracting Telescopes: Galileo and Kepler
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Reflecting Telescope: Newton’s InnovationReduced
chromatic aberration
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Modern Telescopehttp://
www.youtube.com/watch?v=0jPE7u3bz_E
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BinocularsTwo refracting
telescopesTotal internal
reflectionLonger light path
results in better magnification
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Sight & Human Eye
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Structure – Human Eye
Cow Eye Dissection - http://www.youtube.com/watch?v=hZ4mUMsMfTQ&feature=related
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Focussing – Human Eye
Ciliary muscles make the lens shorter and thicker to focus a nearby object
Relaxed eye lens focusses on a distant object
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Eye vs. Camera
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Correcting Vision Using LensesCommon causes of poor vision:Incorrect shape of eyeballIncorrect shape of corneaHardening of the lens
Corrected by:GlassesContact lensesLaser eye surgery
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Myopia – Near Sightedness
Long eyeball results in image formation in front of the retina
Rays spread again and result in blurry image
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Hyperopia – Far Sightedness
Short eyeball results in reaching of light rays at the retina before they converge
Blurry image
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Presbyopia
Symptoms often like Hyperopia (far sightedness)
Aging causes ciliary muscles to be less flexbile and can no longer make the lens change shape to focus on objects at different locations
Solution is bifocals.
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AstigmatismCornea is
oval shaped instead of spherical.
Causes light to focus on two or more spots.
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Night Vision DevicesYou tube rescue with Night Vision
Aid (40 sec. long)http://www.youtube.com/watch?v=u-6Vd1gc8AAYou tube night vision goggles (3
minutes long) http://www.youtube.com/watch?v=BOpJzH0XX-c
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Optical Illusions
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Optical Illusions
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Optical Illusions
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Optical Illusions
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Optical Illusions
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Optical Illusions
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Animated Optical Illusionshttp://
www.youtube.com/watch?v=lvvcRdwNhGM
http://www.youtube.com/watch?v=T5xtRdLOopU
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I “Speye” Activity & Homeworkp. 514 - Complete Part 1 – 3 with a
partnerp. 511 # 4, 5 and 8