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UNIT 8 Light and Optics

UNIT 8 Light and Optics. Thur sday February 23 r d. Light and Optics. Thur sday , February 23. TODAY’S AGENDA. Refraction Thin Lenses Biconvex Lens Hw : Practice A (all) p493. UPCOMING…. Fri : Thin Lenses Biconcave Lens Mon: Total Internal Reflection. Chapter 14

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UNIT 8 Light and Optics

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  1. UNIT 8Light and Optics

  2. Thursday February 23rd Light and Optics

  3. Thursday, February 23 TODAY’S AGENDA • Refraction • Thin Lenses Biconvex Lens • Hw: Practice A (all) p493 UPCOMING… • Fri: Thin Lenses Biconcave Lens • Mon:Total Internal Reflection

  4. Chapter 14 Light and Refraction

  5. Index of Refraction In general, light slows somewhat when traveling through a medium. The index of refraction of the medium is the ratio of the speed of light in vacuum to the speed of light in the medium:

  6. Refraction: Snell’s Law Light changes direction when crossing a boundary from one medium to another. This is called refraction, and the angle the outgoing ray makes with the normal is called the angle of refraction.

  7. Chapter 14 Image Position for Objects in Different Media

  8. Refraction: Snell’s Law The angle of refraction depends on the indices of refraction, and is given by Snell’s law:

  9. Thin Lenses Thin lenses are those whose thickness is small compared to their radius of curvature. They may be either converging (a) or diverging (b).

  10. Thin Lenses Focal Point Biconvex Lens

  11. Mirrors and Lenses Lenses that are thicker at the center (A) spread out light rays. (B) bend light rays to a point beyond the lens. (C) have no effect on light rays. (D) reflect light rays back.

  12. real smaller inverted Thin Lenses Biconvex Lens 2f’ f’ 2f f Real Image Case 1 Image Characteristics Image found between f’ and 2f’

  13. real same inverted f 2f f’ 2f’ Thin Lenses Biconvex Lens Real Image Case 2 Image Characteristics Image found on 2f’

  14. real larger inverted f 2f f’ 2f’ Thin Lenses Biconvex Lens Real Image Case 3 Image Characteristics Image found beyond 2f’

  15. f 2f f’ 2f’ Thin Lenses Biconvex Lens Case 4 Vampire case Image Characteristics No Image

  16. Magnifying Glass f 2f f’ 2f’ virtual larger upright Thin Lenses Biconvex Lens Case 5 Virtual Image Image Characteristics image found behind the object

  17. Thin Lenses di do Similar Triangles f f hi Biconvex Lens ho

  18. Thin Lenses Similar Triangles Biconvex Lens do di ho f f hi

  19. Thin Lenses Biconvex Lens Lens Equation

  20. Lenses A biconvex lens has a focal length f. An object is placed between f and 2f on the axis. The image formed is located (A) at 2f. (B) between f and 2f. (C) at f. (D) at a distance greater than 2f from the lens.

  21. Thin Lenses Virtual Focal Point Biconcave Lens

  22. Thin Lenses virtual smaller upright Biconcave Lens Only Case f’ f Virtual Image Image Characteristics image found between lens and f

  23. Lenses The images formed by biconcave lenses (A) are always real. (B) are always virtual. (C) could be real or virtual; it depends on whether the object distance is smaller or greater than the focal length. (D) could be real or virtual, but always real when the object is placed at the focal point.

  24. END

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