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WVU PHYS 102 - Final Exam Study Guide
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PHYS 102 1nd EditionFinal Exam Study Guide Lectures: 31-39Lecture 31 (November 12)What are the three types of mirrors? What are they used for? How do you calculate Magnification? What do the results tell you about the image? How do you calculate for focal length? The three types of mirrors are flat, concave, and convex. The flat mirrors are shiny on one side and dark on the back. Concave mirrors are good for makeup application & … & dentists. Convex mirrors are good for shoplifting, rear mirror of a car &…. You calculate magnification by using: M = hi/ho. The results tell you that if M = 1 it is the same size. If M < 1, the image is small. If M > 1, the image is large. H0 = Hi for a flat mirror (same size). You calculate for focal length by using this equation: (1/p) + (1/q) = (1/f), where f is the focal length. Lecture 32 (November 14) Why is the ray that passes along the radius reflected back along the same line? R is the normal, the angle of incidence = the angle of reflection = 0. Lecture 33 (November 17)What are images produced by convex mirrors in term of real/virtual and inverted/upright? Whatabout the image produced from a diverging lens? Images produced by convex mirrors are small, upright, and virtual. The images produced by diverging lenses are small, virtual, and upright as well. Lecture 34 (November 19) How would you calculate q and M if given f and p? Given that f = 10 cm and p = 20 cm. You could calculate q using: (1/p) + (1/q) = (1/f). If you plug the values in, you should get q = 20 cm. Because it is positive, it is real. You would then calculate magnification by using: m = -q/p. If you plug the values in, you should get -1. Because it is a negative value it is inverted. Lecture 35 (November 21) What is the equation for calculating focal length? What are the values for each variable for eachdifferent type of mirror/lens?The equation for calculating focal length Is (1/p) + (1/q) = (1/f). For convex mirrors & diverging lens, f is negative. For convex & diverging lens, q is negative (meaning it’s always virtual). P is always positive. For concave mirror or converging lens, q could be positive (for real image) and could be negative (for virtual image). Lecture 36 (December 1) What determines color? If it is constructive interference or destructive interference what is it in terms of minimum/maximum, dark/bright? Color is not due to pigment, but is due to the interference effect. If it is constructive interference, it is light and maximum. If it destructive interference, it is dark and minimum. Lecture 37 (December 3)What does pH stand for? What is the path difference equation for bright (constructive) interference and dark (destructive) interference? What equation is Young’s double slit? What equation would you use to solve for wavelength?PH stands for potential Hydrogen. The path difference equation for bright (constructive) interference is m, whereas the path difference for dark (destructive) is (m + ½). The distance depends on the apparatus. Young’s double slit equation is distance = d sin . For x-rays, it is 2 d sin . To solve for wavelength, you would use d (Y/L) = m . Lecture 38 (December 5) A monochromatic light source has a pair of closely spaced slits. The target area has three photo detectors: A,B, and C. Detectors A and C are in the line of sight of the source and slits, with B midway between. Which of the following can be stated with certainty? Why do the two headlights of your car not produce fringes? It can be said with certainty that lots of photons will reach B. They don’t produce fringes because they are not coherent! Lecture 39 (December 8)Know how to derive n = tan p. What is Brewster’s formula? What is Brewster’s angle? Sin (90 - p) = cos pSin p = n cos pSin p /cos p = n Tan p = n  This is Brewster’s formula. p is Brewster’s


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WVU PHYS 102 - Final Exam Study Guide

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