1 / 15

Optics

Optics. Mirrors and Lenses. surface normal. same angle. Reflection. We describe the path of light as straight-line rays Reflection off a flat surface follows a simple rule: angle in (incidence) equals angle out (reflection) angles measured from surface “normal” (perpendicular)

stuartj
Download Presentation

Optics

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

  2. surface normal same angle Reflection • We describe the path of light as straight-line rays • Reflection off a flat surface follows a simple rule: • angle in (incidence) equals angle out (reflection) • angles measured from surface “normal” (perpendicular) Law of Reflection: Angle of incidence = Angle of reflection exit ray reflected ray incident ray

  3. Reflection Vocabulary • Real Image – • Image is made from “real” light rays that converge at a real focal point so the image is REAL • Can be projected onto a screen because light actually passes through the point where the image appears • Always inverted

  4. Reflection Vocabulary • Virtual Image– • “Not Real” because it cannot be projected • Image only seems to be there!

  5. UCSD: Physics 8; 2006 Mirrors and Reflection • Mirrors reflect light.

  6. Virtual Images in Plane Mirrors

  7. LEFT- RIGHT REVERSAL AMBULANCE

  8. View kacleaveland's map Taken in a place with no name (See more photos or videos here) "Have you ever approached a giant concave mirror? See your upside-down image suspended in mid-air. Walk through the image to see a new reflection, right-side-up and greatly magnified. In the background you see reflected a room full of visitors enjoying other Concave Mirrors • Curves inward • May be real or virtual image

  9. Convex Mirrors • Curves outward • Reduces images • Virtual images • Use: Rear view mirrors, store security… CAUTION! Objects are closer than they appear!

  10. Refraction • Light also goes through some things • glass, water, eyeball, air, lenses

  11. UCSD: Physics 8; 2006 Lenses and Refraction • Lenses refract light

  12. A n1 = 1.0 n2 = 1.5 B Refraction at a plane surface • Light bends at interface between two mediums • bends more the larger the difference in refractive index

  13. Convex Lenses Thicker in the center than edges. • Lens that converges (brings together) light rays. • Forms real images and virtual images depending on position of the object The Magnifier

  14. Concave Lenses • Lenses that are thicker at the edges and thinner in the center. • Diverges light rays • All images areupright and reduced. The De-Magnifier

  15. How You See • Near Sighted – Eyeball is too long and image focuses in front of the retina • Near Sightedness – Concave lenses expand focal length • Far Sighted – Eyeball is too short so image is focused behind the retina. • Far Sightedness – Convex lens shortens the focal length.

More Related