Lens Technologies. Microscopes Invented by Johannes and Zacharias Jansen in 1590 Larger inverted...
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Transcript of Lens Technologies. Microscopes Invented by Johannes and Zacharias Jansen in 1590 Larger inverted...
Lens Technologies
Microscopes
Invented by Johannes and Zacharias Jansen in 1590
Larger inverted image
Used in study of cells and diseases
Refracting Telescopes: Galileo and Kepler
Reflecting Telescope: Newton’s InnovationReduced
chromatic aberration
Modern Telescopehttp://
www.youtube.com/watch?v=0jPE7u3bz_E
BinocularsTwo refracting
telescopesTotal internal
reflectionLonger light path
results in better magnification
Sight & Human Eye
Structure – Human Eye
Cow Eye Dissection - http://www.youtube.com/watch?v=hZ4mUMsMfTQ&feature=related
Focussing – Human Eye
Ciliary muscles make the lens shorter and thicker to focus a nearby object
Relaxed eye lens focusses on a distant object
Eye vs. Camera
Correcting Vision Using LensesCommon causes of poor vision:Incorrect shape of eyeballIncorrect shape of corneaHardening of the lens
Corrected by:GlassesContact lensesLaser eye surgery
Myopia – Near Sightedness
Long eyeball results in image formation in front of the retina
Rays spread again and result in blurry image
Hyperopia – Far Sightedness
Short eyeball results in reaching of light rays at the retina before they converge
Blurry image
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.
AstigmatismCornea is
oval shaped instead of spherical.
Causes light to focus on two or more spots.
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
Optical Illusions
Optical Illusions
Optical Illusions
Optical Illusions
Optical Illusions
Optical Illusions
Animated Optical Illusionshttp://
www.youtube.com/watch?v=lvvcRdwNhGM
http://www.youtube.com/watch?v=T5xtRdLOopU
I “Speye” Activity & Homeworkp. 514 - Complete Part 1 – 3 with a
partnerp. 511 # 4, 5 and 8