PHYS 101 1st Edition Lecture 33Outline of Last Lecture I. Types of Mirrors II. LensesOutline of Current Lecture III. Practice Problems Current Lecture III. Practice Problems A. #31: A) f = 10 cm , p = 20 cm , q = ? (1st two cases in your handout) (1/p) + (1/q) = (1/f) (1/20) + (1/q) = (1/10) q = 20 cm (+, meaning it’s real) m = -q/p = - (20)/(20) = -1 (-, meaning it’s inverted) B. p = 10 cm , f = 10 cm By calculation & by ray diagram (1/p) + (1/q) = (1/f) (1/10) + (1/q) = (1/10) (1/q) = (1/10) – (1/10) (1/q) = 0 flip 1/q = 0/1 q/1 = 1/0 q = (either no image or image is at )C. p = 5 cm , f = 10 cm These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.P < f(1/p) + (1/q) = (1/f) (1/5) + (1/q) = (1/10) q = -10 (- meaning virtual, not from real rays) M = -q/p = -(-10)/(5) = +2 (+ meaning upright; twice the size of the
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