1 / 7

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.

sabina
Télécharger la présentation

Optics: Mirrors and Lenses 3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related