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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)

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Optics

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  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.

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