Exam 3--PHYS 102--S10
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1 ame: Exam 3--PHYS 02--S0 Multiple Choice Identify the choice that best completes the statement or answers the question.. At an intersection of hospital hallways, a convex mirror is mounted high on a wall to help people avoid collisions. The mirror has a radius of curvature of 4.0 m. A patient is 4.0 m from the mirror. What is the magnification of the image created by the mirror? a. 3 c. b. - d. 2. A dentist uses a mirror to examine a tooth that is 2.00 cm in front of the mirror. The image of the tooth is formed 4.0 cm behind the mirror. Determine the mirror's focal length. 2 3 a. 0.2 cm c..33 cm b. 8.0 cm d. 4 cm
2 3. A 2.00-cm-high object is placed 3.00 cm in front of a concave mirror. If the image is 5.00 cm high and virtual, what is the image distance of the image? a. -.4 cm c. 3.2 cm b cm d. -.2 cm 4. A person uses a convex lens that has a focal length of 2.5 cm to inspect a gem. The lens forms a upright image. Is the image real or virtual? a. virtual c. neither, no image is formed b. real d. not enough information 5. A concave lens has a focal length of 0.0 cm. If the object is located at 0 cm to the left of the lens, where is the image? a. 5 cm to the left of the lens c. 20 cm to the left of the lens b. there is no image d. 0 cm to the right of the lens 2
3 6. You focus on an object that is very far away. Then, the object moves closer to you. The focal length of your eye lens has... a. increased c. stayed the same b. decreased 7. This figure shows a two-lens system. If the object is a distance of p=30 cm to the left of lens. What is the location of the final image created by lens 2? a. 47 cm to the right of lens 2 c. 33 cm to the right of lens 2 b. 60 cm to the left of lens 2 d. 50 cm to the right of lens 2 8. What happens to the image size in a flat mirror when you move away from the mirror? a. it gets bigger c. it remains the same size b. it gets smaller d. it depends on the size of the mirror 9. If you want to set fire to a pile of leaves with a lens, which of these is the best one to use? a. convex lens c. neither of these b. concave lens d. both of these will work 3
4 0. The following figure shows the positions of a mirror, the object, and the image. What type of mirror would produce the image as shown? a. concave mirror c. flat mirror b. convex mirror d. Either concave or convex. Lenses experience which of these aberrations: I. Spherical Aberration II. Chromatic Aberration a. I c. I & II b. II d. neither of these 2. A laser beam (λ= 500 nm) is incident on two slits mm apart. What is the distance between the central fringe and the first bright fringe on a screen 5 m away? a. x0-6 mm c mm b. 3. mm d. there is no interference pattern 4
5 3. A double slit of width 0.02 mm is illuminated by a laser with wavelength of 500 nm. How many fringes are present on the screen (include both sides of the pattern and the central fringe)? a. 8 c. 80 b. 60 d. there are an infinite number of fringes in the pattern 4. Helium -neon laser light (λ = nm) is sent through a mm-wide single slit. What is the width of the central maximum on a screen.00 m from the slit? a. 4.2 mm c. 0.3 mm b..0 m d. 2. mm 5. A diffraction grating has 3000 lines per centimeter. What is the slit spacing, d, for this grating? a m c. 3.3x0-6 m b..2x0-4 m d. 3.x0-3 m 5
6 6. A diffraction grating has 3000 lines per centimeter. Light incident on the diffraction grating shows its first 2 orders at angles of 2.0 and What is the wavelength of the light? a. 300 nm c. 690 nm b. 720 nm d. 400 nm 7. The following figure shows a Michelson interferometer. If the source of light is a laser of wavelength λ, what is the smallest distance the translating mirror must move ( x) in order to see a shift on the detector of fringe (ie. where there was once a dark fringe, there would now be a bright fringe)? a. 2 λ c. 4 λ b. λ d. λ 2 6
7 8. The following figure shows the interference pattern produced by a diffraction grating. What is the pathlength difference of the two waves that are incident to create the dark fringe indicated by the arrow? a. λ 4 c. λ b. 2 λ d. 2 λ 9. In a single slit diffraction pattern, what would you do to make the central bright spot narrower? a. decrease the slit width c. increase the wavelength b. move the screen further away d. increase the slit width 20. These 2 waves are: a. in phase c. 80 out of phase b. 360 out of phase d. 90 out of phase 7
8 2. What caused the diffraction pattern in this picture? a. light from a light bulb incident on a double slit c. light incident on a circular object (such as a penny) b. a laserbeam incident on a single slit d. none of these 22. Place these stages in the proper order for the formation of a star:. Star 2. Protostar+disk 3. Star-forming cloud 4. Star-forming core a. 3, 2, 4, c. 3, 4, 2, b. 4, 3, 2, d. 2, 3, 4, 23. Why is star-formation activity more readily apparent in infrared observations than in visible images? a. visible light is obscured by the dust in star-forming regions b. infrared light can pass through dust unattenuated c. star-forming regions emit radiation mostly in the infrared part of the spectrum d. all of these 8
9 24. This plot has reddening and distance for a group of stars. Which of these statements best describes the location of the stars in the box on the plot? a. beside a star-forming core c. in another galaxy b. behind a star-forming core d. in front of a star-forming core 25. The answer to this question is A. a. A c. C b. B d. D 9
10 ID: A Exam 3--PHYS 02--S0 Answer Section MULTIPLE CHOICE. ANS: D PTS: 2. ANS: D PTS: 3. ANS: B PTS: 4. ANS: A PTS: 5. ANS: A PTS: 6. ANS: B PTS: 7. ANS: A PTS: 8. ANS: C PTS: 9. ANS: A PTS: 0. ANS: A PTS:. ANS: C PTS: 2. ANS: C PTS: 3. ANS: A PTS: 4. ANS: A PTS: 5. ANS: C PTS: 6. ANS: C PTS: 7. ANS: C PTS: 8. ANS: B PTS: 9. ANS: D PTS: 20. ANS: D PTS: 2. ANS: C PTS: 22. ANS: C PTS: 23. ANS: D PTS: 24. ANS: B PTS: 25. ANS: A PTS:
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