Announcements 11/5/12 Prayer Term project progress reports due Saturday night

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Announcements 11/5/12  Prayer  Term project progress reports due Saturday night  Slinkies: Ryan & Clement Frank & Ernest From warmup  Extra time on?…
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Announcements 11/5/12  Prayer  Term project progress reports due Saturday night  Slinkies: Ryan & Clement Frank & Ernest From warmup  Extra time on? a.(nothing in particular)  Other comments? a.(nothing in particular) Class-designed problem  p = _____  Lens 1: f = _____  Distance to Lens 2 = _____  Lens 2: f = _____ 5 mins for class to solve  Ray diagram? (for first lens)  Final q = ? Real or virtual?  Mtot = ? Upright or inverted? 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 = 15 cm Aberrations 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 Clicker question: Chromatic Aberration  Red light coming from O produces an image at I. Where will blue light coming from O form an image? a. same place Lens-makers’ eqn: b. closer to the lens 1  1 1    n  1    c. farther from lens f  R1 R2  How does a camera work?  Simplest picture  What if you leave out the lens?  What’s a pinhole camera? From warmup  If the camera is initially focused on a distant object, to focus on a close object , must the lens be moved away from the CCD or moved toward the CCD? a. Away from the CCD, because since the focal length of the lens is constant, if p gets smaller, q must get bigger. F-number  f# = The focal length divided by the diameter of the lens Clicker question:  How does the f-number of a lens relate to the half-angle of the “light cone” formed by parallel light entering the q lens? a. q  2cos1   1   f-number  b. q  sin 1  f-number   1  c. q  sin 1    f-number  d. q  tan 1  f-number  1  1  e. q  tan    2  f-number  From warmup  Suppose you are comparing two cameras which both use the same size sensor and the same zoom level. One of them gives the aperture specification as f/2.8 whereas the other one is f/2.2 . Which one allows more light to reach the sensor? (Or do they allow the same?) a. f/2.2, because it increases the area of aperture b. That depends on how long the shutter is open for each one. The one with f/2.2 will let more light through in a given time, but if the shutter speeds are timed differently, then in a single picture they may let the same amount of light through, or either one may have more. Cameras: f-stops  Which has the higher f-number?  What’s the advantage of one over the other? Clicker 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? a. Converging lenses b. Diverging lenses Near point vs. Far point  Far point: how far away can you focus on things a. Regular person: fp = infinity b. Nearsighted person: fp = much smaller – For me, my fp  1 m (right eye), 0.5 m (left eye)  Near point: how close can you see things comfortably a. Regular person: np  25 cm b. Farsighted person: np = much larger How to fix things with glasses? Nearsighted: object at  cm  image at –fp (diverging lens) Farsighted: object at 25 cm  image at –np (converging lens)
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