Lens Technologies. Microscopes Invented by Johannes and Zacharias Jansen in 1590 Larger inverted image Used in study of cells and diseases.

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Presentation transcript:

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 Innovation Reduced chromatic aberration

Modern Telescope _E _E

Binoculars Two refracting telescopes Total internal reflection Longer light path results in better magnification

Sight & Human Eye

Structure – Human Eye Cow Eye Dissection -

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 Lenses Common causes of poor vision: Incorrect shape of eyeball Incorrect shape of cornea Hardening of the lens Corrected by: Glasses Contact lenses Laser 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.

Astigmatism Cornea is oval shaped instead of spherical. Causes light to focus on two or more spots.

Night Vision Devices You tube rescue with Night Vision Aid (40 sec. long) 6Vd1gc8AA You tube night vision goggles (3 minutes long) XX-c XX-c

Optical Illusions

Animated Optical Illusions wNhGM wNhGM dLOopU dLOopU

I “Speye” Activity & Homework p Complete Part 1 – 3 with a partner p. 511 # 4, 5 and 8

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