Exam 4--PHYS 102--S15
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1 Name: Class: Date: Exam 4--PHYS 02--S5 Multiple Choice Identify the choice that best completes the statement or answers the question.. A mirror produces an upright image. The object is 8 cm high and to the left of the mirror; the image is 4 cm high. The center of curvature of the mirror is 6 cm. Where is the image located? 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 4. Consider the rays drawn for this concave mirror. Which ray(s) is/are drawn incorrectly? a. 6 cm to the righ of the mirror b. at the mirror s focal point c. 8 cm to the right of the mirror d. 4 cm to the right of the mirror e. 8 cm to the left of the mirror 2. A security mirror has a focal length of 20 cm. If you stand 40 cm from the mirror, what is its magnification? a. Ray b. Ray 2 c. Ray 3 d. Rays & 2 e. All are drawn incorrectly a. -2 b. + c. -8 d. + 3
2 5. A convex lens has a focal length of 30 cm. An object is 0 cm from the lens. What is the magnification? a. + 2 b. +3 c. there is no image d. 3 e What kind of mirror produces a virtual image that is smaller than the object? a. convex b. concave c. flat d. both a & b 7. Which of these ray(s) is/are drawn incorrectly? 8. A concave lens can produce: I. a virtual image II. a real image III. a magnified image IV. an upright image a. I b. II c. I & IV d. I, II, and III e. all of these 9. Nearsightedness is corrected with a concave lens. What type of device is this? a. converging b. diverging c. either, it depends on the severity of the vision problem 0. A person uses a converging lens that has a focal length of 0 cm to inspect a gem. The lens forms a virtual image 20 cm away. What is the magnitude of the magnification? a. # b. #2 c. #3 d. # & #3 e. none are incorrect a. /2 b. 3 c. 2 d..5. Consider this 2-lens system. What is the final magnification? a. -3 d. + b. 2.5 e. 2 c. +3 2
3 2. What causes a mirage you see while driving on a road? a. the refraction of light in warm air b. the reflection of light on the road c. the reflection of light from the atmosphere d. the refraction of light at your windshield 3. Mirrors experience which of these aberrations: I. Spherical Aberration II. Chromatic Aberration a. I b. II c. I & II d. neither of these 4. The human eye has a lens that can change its focal length. When is the focal length of the eye s lens the largest? a. when the object is far away b. when the object is near c. when the eye is out of focus d. none of these 7. Two waves of wavelength 4 meters travel through space. The first wave travels 8 meters. The second wave travels 2 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. 8. In a Young's double-slit interference apparatus, by what factor is the distance between adjacent light and dark fringes changed when the wavelength of the source is doubled? a. /4 b. 2 c. d. /2 9. A Young's double-slit apparatus is set up so that a screen is positioned.6 m from the double slits and the spacing between the two slits is mm. What is the distance between the central and st bright fringes on the screen if the light source has a wavelength of 630 nm? 5. When two waves are offset by one-half of a 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 6. These two waves are offset because they ve travelled diffent pathlengths. By what amount are they out of phase? a m b m c m d m a. 0 b. 45 c. 90 d. 80 3
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 bright fringe (with the arrow)? 24. At what angle with the second order maximum occur for a wavelength of 400 nm using a diffraction grating with 0000 lines per cm? a. 2λ b. 2 λ c. 3λ d. 3 λ 2. A single slit is used to create an interference pattern on a screen. If you increase the wavelength of the light, what happens to the width of the central bright fringe? a. it is wider b. it is narrower c. it remains the same d. it immediately vanishes a. 5.5 b. 24 c. No second order maximum will occur in this case. d What caused the diffraction pattern in this picture? 22. A diffraction grating has 4000 lines/cm. What is the slit separation? a. 4.0x0-6 m b. 0.25x0-6 c. 2.5x0-6 m d. 0.4x0-6 m 23. What is the highest order maximum for wavelength 450 nm than can be obtained with a grating with slit separation of.7x0-6 m? a. 3 b. 4 c. 6 d. 7 a. light from a light bulb incident on a double slit b. a laserbeam incident on a single slit c. light incident on a circular object (such as a penny) d. none of these 26. What is your favorite class? a. Physics b. Physics c. Physics d. Physics 4
5 ID: A Exam 4--PHYS 02--S5 Answer Section MULTIPLE CHOICE. ANS: D PTS: REF: S5-WWP 2. ANS: D PTS: REF: S5-WWP 3. ANS: D PTS: REF: S5-PHYS 02-WWP 4. ANS: D PTS: REF: S5-WWP 5. ANS: E PTS: REF: S5-WWP 6. ANS: A PTS: REF: S5-WWP 7. ANS: D PTS: REF: S5-WWP 8. ANS: C PTS: REF: S5-WWP 9. ANS: B PTS: REF: S5-WWP 0. ANS: B PTS: REF: S5--WWP,2M. ANS: D PTS: REF: S5-WWW 2. ANS: A PTS: REF: S5-WWP 3. ANS: A PTS: REF: S5-WWP 4. ANS: A PTS: REF: S5-WWP 5. ANS: B PTS: REF: S5-WWP 6. ANS: C PTS: REF: S5-WWP 7. ANS: A PTS: REF: S5-WWP 8. ANS: B PTS: REF: S5-WWP 9. ANS: B PTS: REF: S5-WWP 20. ANS: A PTS: REF: S5-WWP 2. ANS: A PTS: REF: S5-WWP 22. ANS: C PTS: REF: S5 23. ANS: A PTS: REF: S5 24. ANS: D PTS: REF: S5 25. ANS: C PTS: 26. ANS: D PTS:
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