Exam 5--PHYS 102--S14
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- Clarence Malone
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1 Class: Date: Exam 5--PHYS 02--S4 Multiple Choice Identify the choice that best completes the statement or answers the question.. Select the correct ray diagram for the object in front of the mirror as shown here: 2. Select the correct ray diagram for the object in front of the lens as shown here: b. b. c. c. d. d. 3. A negative magnification indicates that the image is: inverted b. smaller than the object c. real d. upright e. virtual
2 4. A convex lens produces an image twice the size of the object. The object is placed: two focal lengths in front of the lens b. half a focal length in front of the lens c. half a focal length behind the lens d. one focal length in front of the lens 5. A concave mirror makes a 3 cm image of a 6 cm object when the object is placed 0 cm from the mirror. What is the focal length of the mirror? 6. Optometrists describe the power of a lens as the inverse of the focal length, where focal length is in meters and power is in diopters. Power f The magnification of a 3 cm high object placed 5 cm from a certain lens is - (ie M=-). What is the power of the lens? 3.3 cm b. 0 cm c cm d. -0 cm 250 diopters b. 20 diopters c. 40 diopters d. 200 diopters 7. Which of the following can make a real, inverted image? convex lens b. plane mirror c. concave lens d. convex mirror 8. For the following arrangement of lenses, l=32 cm, f =6 cm, f 2 =8 cm, and x=24 cm. What is the magnification of the final image? 6 c. 2 b. 3 d. 2 2
3 9. A spherical mirror can have: chromatic aberrations b. spherical aberrations c. both of these d. neither of these 0. Real images are usually formed: behind a concave mirror b. in front of a convex lens c. on the human retina d. behind a concave lens e. all of these. A mirror produces an upright image of an object. The object is 4 cm high; the image is 2 cm high. If the mirror has a focal length of 20 cm, where is the object located? 3. The easiest way to correct for spherical aberrations in a lens is to: add a color filter before the lens b. use an aperture c. disperse the light d. use a concave lens 4. 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 m. What is the magnification of a patient 2 meters from the mirror? 20 cm b. 5 cm c. cm d. 0 cm 2. Ansel places an object 30 cm from a thin convex lens along the axis. If a real image forms at a distance of 0 cm from the lens, what is the focal length of the lens? b. 2 c. 0.5 d. there is no image 5. The human eye has a lens that can change its focal length. When is the focal length of the eye s lens the largest? when the object is far away b. when the object is near c. when the eye is out of focus d. none of these 6. Concave lenses and convex mirrors are what class of optical devices? converging b. diverging c. neither of these d. both of these 7. What type of lens is this? 0 cm b. 5 cm c. 30 cm d. 7.5 cm plano-convex b. convex c. plano-concave d. concave 3
4 8. Mirages are a result of. refraction b. reflection c. diffraction d. dispersion 9. Because of atmospheric refraction, the sun at sunset even though it is the horizon. appears, below b. disappears, below c. appears, above d. disappears, above 20. For a single-lens system, virtual images are alway on the the object. opposite side of b. same side as 2. A convex lens is a magnifying glass. What type of image is formed when you use this type of lens as a magnifying glass? virtual b. real 22. I stand m in front of a flat mirror. What is the distance between me and my image? 2 m b. 4 m c. 0.5 m d. m 23. A flat mirror may form a virtual image: either in front of the mirror or behind the mirror b. in front of the mirror only c. A plane mirror cannot form a virtual image. d. behind the mirror only 4
5 ID: A Exam 5--PHYS 02--S4 Answer Section MULTIPLE CHOICE. ANS: A PTS: 2. ANS: B PTS: 3. ANS: A PTS: 4. ANS: B PTS: 5. ANS: A PTS: 6. ANS: C PTS: 7. ANS: A PTS: 8. ANS: A PTS: 9. ANS: B PTS: 0. ANS: C PTS:. ANS: A PTS: 2. ANS: D PTS: 3. ANS: B PTS: 4. ANS: C PTS: 5. ANS: A PTS: 6. ANS: B PTS: 7. ANS: A PTS: 8. ANS: A PTS: 9. ANS: A PTS: 20. ANS: B PTS: 2. ANS: A PTS: 22. ANS: A PTS: 23. ANS: D PTS:
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