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Optics: Mirrors and Lenses 3

Optics: Mirrors and Lenses 3. 23-7, 23-8. Two Lens System. The image for the first lens becomes the object for the second lens. Two Lens Instruments. Microscopes at least two convex lenses Virtual and enlarged Refracting Telescope 2 convex lenses Virtual, enlarged and inverted.

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Optics: Mirrors and Lenses 3

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  1. Optics: Mirrors and Lenses 3 23-7, 23-8

  2. Two Lens System • The image for the first lens becomes the object for the second lens

  3. Two Lens Instruments • Microscopes • at least two convex lenses • Virtual and enlarged • Refracting Telescope • 2 convex lenses • Virtual, enlarged and inverted

  4. The Eye and its Lenses • The eye focuses images on the retina • Muscles change the shape of the lens • Relaxed – distant object focused on retina • Contracted – f shortened, objects 25cm or closer in focus • Around 45 years old the lens stiffens and the muscles cannot shorten the f enough • Most refraction takes place at the curved surface of the cornea

  5. The Eye and its Lenses • Myopia • f is too short • Images of distant objects are in front of the retina • Corrected by concave lens • Diverges rayswhich increases di • Moves image back to the retina

  6. The Eye and its Lenses • Hyperopic • Farsighted • F is too long, image is behind retina • Convex lens corrects because virtual image is farther from the eye than the object

  7. The Eye and its Lenses • Astigmatism • Contact Lenses

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