Name: Class: Date: Exam 4--PHYS 102--S15 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. A mirror produces an upright image. The object is 2 cm high; the image is 8 cm high. The center of curvature of the mirror is 16 cm. Where is the object located? 4. Consider the rays drawn for this concave mirror. Which ray(s) is/are drawn incorrectly? a. 12 cm b. 16 cm c. 8 cm d. 6 cm 2. A convex mirror has a focal length of 10 cm. An object is 10 cm from the mirror. Where is the image located? a. 10 cm b. 20 cm c. there is no image d. 5 cm a. Ray 1 b. Ray 2 c. Ray 3 d. Rays 1 & 2 e. All are drawn incorrectly 5. What kind of mirror produces a virtual image that is larger than the object? a. convex b. concave c. flat d. both a & b 6. Which of these ray(s) is/are drawn incorrectly? 3. This shows an optical device and the image it creates. What kind of lens or mirror is it? a. convex lens b. concave lens c. convex mirror d. concave mirror a. #1 b. #2 c. #3 d. #1 & #2 e. none are incorrect 1
7. A convex lens can produce: I. a virtual image II. a real image III. a magnified image IV. an upright image a. I b. II c. III & IV d. I, II, and III e. all of these 8. A convex lens has a focal length of 30 cm. An object is 60 cm from the lens. What is the magnification? 9. Farsightedness is corrected with a convex lens. What type of device is this? a. converging b. diverging c. either, it depends on the severity of the vision problem 10. A person uses a converging lens that has a focal length of 10 cm to inspect a gem. The lens forms a virtual image 20 cm away. What is the magnitude of the magnification? a. there is no image b. +1.5 c. -1 d. + 1 2 e. +2 a. 2 b. 1/2 c. 1.5 d. 3 11. Consider this 2-lens system. What is its final magnification? a. +2 d. -1.5 b. -0.67 e. +1 c. -3 12. If the Earth s atmosphere no longer existed, how would the time of sunset be affected? a. Sunset would occur earlier b. Sunset would occur later c. Sunset time would not change d. No way to tell 13. Lenses experience which of these aberrations: I. Spherical Aberration II. Chromatic Aberration a. I b. II c. I & II d. neither of these 2
14. A camera can focus on different objects by changing the distance between the lens and film. When is this distance the largest? a. when the object is far away b. when the object is nearby c. it depends on the size of the image d. none of these 18. A Young's double-slit apparatus is set up. A screen is positioned 1.60 m from the double slits and the spacing between the two slits is 0.040 0 mm. The distance between the central and 1st bright fringes is 1.42 cm. What is the light source wavelength? 15. When two waves are offset by one wavelength, they experience. a. total constructive interference b. total destructive interference c. interference, but not total constructive or destructive intereference d. none of these; it depends on the wavelength 16. These two waves are offset because they ve travelled diffent pathlengths. By what amount are they out of phase? a. 0 b. 45 c. 90 d. 180 17. Two waves of wavelength 4 meters travel through space. The first wave travels 8 meters. The second wave travels 10 meters. When they meet, what type of interference occurs? a. total constructive interference b. total destructive interference c. neither total constructive nor total destructive interference occurs. a. 490 nm b. 280 nm c. 355 nm d. 710 nm 19. In a Young's double-slit interference apparatus, by what factor is the distance between adjacent light and dark fringes changed when the separation between slits is doubled? a. 1 b. 1/2 c. 2 d. 1/4 20. This figure shows a double-slit diffraction pattern. What is the path-length difference of the light rays that interfere to produce the designated dark fringe (with the arrow)? a. 2λ b. 2 λ c. 3λ d. 3 λ 3
21. A single slit is used to create an interference pattern on a screen. If you increase the width of the slit, what happens to the width of the central bright fringe? 25. What caused the diffraction pattern in this picture? a. it is wider b. it is narrower c. it remains the same d. it immediately vanishes 22. A diffraction grating has 4000 lines/cm. What is the slit separation? a. 0.4x10-6 m b. 0.25x10-6 c. 2.5x10-6 m d. 4.0x10-6 m 23. What is the highest order maximum for wavelength 450 nm than can be obtained with a grating whose slit separation is 1.7x10-6 m? a. light incident on a circular object (such as a penny) b. light from a light bulb incident on a double slit c. a laserbeam incident on a single slit d. none of these 26. What is your favorite class? a. Physics b. Physics c. Physics d. Physics a. 6 b. 3 c. 7 d. 4 24. At what angle with the second order maximum occur for a wavelength of 400 nm using a diffraction grating with 10000 lines per cm? a. 15.5 b. 53 c. 24 d. No second order maximum will occur in this case. 4
ID: A Exam 4--PHYS 102--S15 Answer Section MULTIPLE CHOICE 1. ANS: D PTS: 1 REF: S15-2M 2. ANS: D PTS: 1 REF: S15-2M 3. ANS: C PTS: 1 REF: S15-PHYS 102-2M 4. ANS: B PTS: 1 REF: S15-2M 5. ANS: B PTS: 1 REF: S15-2M 6. ANS: A PTS: 1 REF: S15-2M 7. ANS: E PTS: 1 REF: S15-2M 8. ANS: C PTS: 1 REF: S15-2M 9. ANS: A PTS: 1 REF: S15-2M 10. ANS: D PTS: 1 REF: S15--WWP,2M 11. ANS: C PTS: 1 REF: S15-2M 12. ANS: A PTS: 1 REF: S15-2M 13. ANS: C PTS: 1 REF: S15-2M 14. ANS: B PTS: 1 REF: S15-2M 15. ANS: A PTS: 1 REF: S15-2M 16. ANS: D PTS: 1 REF: S15-2M 17. ANS: B PTS: 1 REF: S15-2M 18. ANS: C PTS: 1 REF: S15-2M 19. ANS: B PTS: 1 REF: S15-2M 20. ANS: B PTS: 1 REF: S15-2M 21. ANS: B PTS: 1 REF: S15--2M 22. ANS: C PTS: 1 REF: S15 23. ANS: B PTS: 1 REF: S15 24. ANS: B PTS: 1 REF: S15 25. ANS: A PTS: 1 26. ANS: B PTS: 1 1