uses of lenses
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Uses of LensesUses of Lenses
November 7, 2012November 7, 2012
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ObjectivesObjectives
1.1. Diagram the different types of Diagram the different types of lenseslenses
2.2. Describe the different uses of Describe the different uses of lenseslenses
3.3. Explain how lenses functionExplain how lenses function
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Types of LensesTypes of Lenses concave lens – where light that concave lens – where light that
passes through diverges as if it came passes through diverges as if it came from a pointfrom a point
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Convex lens – where light that Convex lens – where light that passes through converges to a single passes through converges to a single pointpoint
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What are Lenses Used for?What are Lenses Used for?
1.1. Camera’sCamera’s
2.2. TelescopesTelescopes
3.3. Eyeglasses/ContactsEyeglasses/Contacts
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Camera’sCamera’s Pinhole Camera:Pinhole Camera:
– Simplest of camera’sSimplest of camera’s– A box with a pinhole in the front and film A box with a pinhole in the front and film
paper attached to the backpaper attached to the back– Hole prevents overlapping rays and Hole prevents overlapping rays and
prints a very dim upside down imageprints a very dim upside down image
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Improved lens CameraImproved lens Camera– Lens admits more light (takes less time)Lens admits more light (takes less time)– Allows more rays without overlapping Allows more rays without overlapping
(brighter more focused image) (brighter more focused image)
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Explain in your own words Explain in your own words how this works.how this works.
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The EyeThe Eye
How do the lenses in your eyes help How do the lenses in your eyes help you see?you see?
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EyesightEyesight
Nearsighted – can’t see far awayNearsighted – can’t see far away Farsighted – can’t see close upFarsighted – can’t see close up
What is the importance of the rays What is the importance of the rays meeting at the retina?meeting at the retina?
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Nearsighted VisionNearsighted Vision
The lens becomes shorter and fatterThe lens becomes shorter and fatter
Where do the rays come into focus?Where do the rays come into focus?
How can this be corrected?How can this be corrected?
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Farsighted VisionFarsighted Vision
The lens becomes longer and The lens becomes longer and skinnierskinnier
Where do the rays come into focus?Where do the rays come into focus?
How can this be corrected?How can this be corrected?
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How are camera’s and our How are camera’s and our eyes similareyes similar
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TelescopesTelescopes
GalileoGalileo KeplerKepler
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Galileo’s TelescopeGalileo’s Telescope
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Kepler’s TelescopeKepler’s Telescope
Using a second concave lens Using a second concave lens magnified the image even moremagnified the image even more