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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

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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

  • Draw the ray diagram for this situation: Converging lens, f = 20 cm, p = 80 cm


Quick writing

  • Draw the ray diagram for this other situation: Converging lens, f = 20 cm, p = 15 cm


Quick writing

  • Draw the ray diagram for this third situation: Diverging lens, f = -20 cm, p = 5 cm


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

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


Reducing Spherical Aberration with Aperture


Spherical Aberration


Reducing Spherical Aberration by Reversing Lens


Coma


0 Degree Tilt


10 Degree Tilt


20 Degree Tilt


30 Degree Tilt


40 Degree Tilt


40 Degree Tilt + Aperture


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?

  • Simplest picture

  • What if you leave out the lens?

  • What’s a pinhole camera?


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


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

  • Which has the higher f-number?

  • What’s the advantage of one over the other?


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: 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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