# Announcements 11/5/10

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Announcements 11/5/10  Prayer  Exam being graded, hopefully done by Monday  Survey about Waves HW problems. Only 7 responses so far. (Thanks!) If you…
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Announcements 11/5/10  Prayer  Exam being graded, hopefully done by Monday  Survey about Waves HW problems. Only 7 responses so far. (Thanks!) If you are willing to take the survey, please get your responses in by tonight.  Found PpP book Quick writing  Ralph is confused about the difference between real and virtual images. What can you say to help him understand? Reading Quiz  A converging lens should be: a. convex b. concave Convex/converging Lens at each interface, Snell’s law is satisfied f if not parallel, they parallel rays converge (image formed) converge to the at a different point focal point Where will image be formed? focus focus Ray diagram just like one for concave mirror, except rays continue to right instead of reflecting back! The equation: 1 1 1 positive q = right Magnification same:   hand side of lens q p q f M  p Concave/diverging Lens f parallel rays seem to be coming from the focal point Diverging lenses virtual image! The equation: 1 1 1   (negative f) p q f Negative q: means image on same side of lens as object (virtual) Demos  Blackboard optics  Real image or not. Class poll: What kind of image is this? a. Real b. Virtual Sign conventions: summary  Assuming that the light rays are coming from the left: quantity positive negative +  p if on the left of the if on the right of the lens/mirror lens/mirror (can only happen in a compound problem) q if on the right of the lens if on the left of the lens (left side of mirror), (right side of mirror), means a real image means a virtual image f if converging: convex if diverging: concave lens/concave mirror lens/convex mirror M if image is right-side up if image is upside-down Reading Quiz  When you look straight down at an object under water, it appears to be ____________ than actuality. a. closer to you b. farther from you Thick lenses and surfaces n1 n2 n2  n1 Careful with signs!!!   p q R (see table 36.2) Lens-makers’ eqn: 1  1 1    n  1    f  R1 R2  Thought question  Can a converging lens ever produce a virtual image? a. Yes b. No Thought question  What happens if I cover up the upper half of lens? a. Nothing b. Upper half of image disappears c. Lower half of image disappears d. Intensity of image goes down by 50% Thought question  Can a diverging lens ever produce a real image? a. Yes b. No Multiple element problems  Image of one becomes object of next  Worked problem: Find qfinal, Mtot f = 20 cm f = -60 cm 60 cm 15 cm Answers: image is 20 cm to right of -60cm lens; M = -0.67 Rest of time: class-designed problems  p = _____  f = _____ Including some with these converging lenses, which we have: f = +8.05 cm f = +9.34 cm f = +17.0 cm f = +20.8 cm f = +45.0 cm  ray diagram = ?  q=?
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