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Announcements 11/8/10. Prayer Exam 2 graded: median score 79 (after 2 pt curve) Found PpP book Still missing slinkies from: Stephen Grant Ty Beus Jon Mortensen Chris Read Roger Brown Tess Larson (I think she dropped; does anyone know her?). Quick writing.

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announcements 11 8 10
Announcements 11/8/10
  • Prayer
  • Exam 2 graded: median score 79 (after 2 pt curve)
  • Found PpP book
  • Still missing slinkies from:
    • Stephen Grant
    • Ty Beus
    • Jon Mortensen
    • Chris Read
    • Roger Brown
    • Tess Larson (I think she dropped; does anyone know her?)
quick writing
Quick writing
  • Draw the ray diagram for this situation: Converging lens, f = 20 cm, p = 80 cm
quick writing1
Quick writing
  • Draw the ray diagram for this other situation: Converging lens, f = 20 cm, p = 15 cm
quick writing2
Quick writing
  • Draw the ray diagram for this third situation: Diverging lens, f = -20 cm, p = 5 cm
reading quiz
Reading Quiz
  • What’s the term used to refer to rays failing to focus because a lens is shaped incorrectly?
    • elliptical aberration
    • hyperbolic aberration
    • parabolic aberration
    • spherical aberration
spherical aberration
Spherical Aberration

Credit: the next several slides were produced by Dr. Durfee

thought question

Lens-makers’ eqn:

Thought question
  • Red light coming from O produces an image at I. Where will blue light coming from O form an image?
    • same place
    • closer to the lens
    • farther from lens

ChromaticAberration

how does a camera work
How does a camera work?
  • Simplest picture
  • What if you leave out the lens?
  • What’s a pinhole camera?
reading quiz1
Reading Quiz
  • What is the f-number of a lens?
    • The focal length in meters
    • The focal length in inches
    • One over the focal length in meters
    • The focal length divided by the diameter of the lens
    • The focal length divided by 25 cm
thought question1

q

Thought question
  • How does the f-number of a lens relate to the half-angle of the “light cone” formed by parallel light entering the lens?
cameras f stops
Cameras: f-stops
  • Which has the higher f-number?
  • What’s the advantage of one over the other?
thought question2
Thought question
  • If you have trouble seeing things far away but can see close objects well, you are “near-sighted”. What kind of lenses do you need in your glasses?
    • Converging lenses
    • Diverging lenses
near point vs far point
Near point vs. Far point
  • Near point: how close can you see things comfortably
    • Regular person: np  25 cm
    • Farsighted person: np = much larger
  • Far point: how far away can you focus on things
    • Regular person: fp = infinity
    • Nearsighted person: fp = much smaller
      • For me, my fp  1 m (right eye), 0.5 m (left eye)
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