Name Class Date. Use the terms from the following list to complete the sentences below. Each term may be used only once. Some terms may not be used.

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1 Assessment Chapter Test B Light and Our World USING KEY TERMS Use the terms from the following list to complete the sentences below. Each term may be used only once. Some terms may not be used. concave lens convex lens nearsightedness plane mirror concave mirror farsightedness real virtual 1. A person whose eyes are too long and whose glasses have concave lenses has the condition called. LOWs2 LOWs1 LOWs2 2. An image through which light passes is a image. 3. The only images produced by a are virtual images. 4. A lens that curves outward is a. LOWs1 5. A mirror that curves inward, like the inside of a bowl, is a(n). LOWs1 UNDERSTANDING KEY IDEAS Write the letter of the correct answer in the space provided. 6. The aperture of a camera works most like an eye s LOWs3 a. lens. c. pupil. b. iris. d. cornea. 7. Light is kept inside an optical fiber due to LOWs3 a. amplification. b. radiation. c. stimulated emission. d. total internal reflection. 8. Polarizing filters produce light waves that LOWs3 a. have a single color. b. vibrate in only one plane. c. vibrate at a low frequency. d. possess tremendous energy. Holt Science and Technology 52 Light and Our World

2 Chapter Test B continued 9. Which of the following is a true statement about the lens of the eye? a. It forms a virtual image. LOWs2 b. It is thinner in its middle than at its edge. c. It functions like a convex mirror to reflect light onto the retina. d. It changes thickness to focus on objects at various distances. 10. A convex mirror and a concave lens both cause light rays to LOWs1 a. slow down. c. gain energy. b. spread apart. d. form blurry images. 11. Which one of the following problems would a driver who has red-green color deficiency face? LOWs2 a. reading stop signs b. seeing double c. distinguishing between stop and go lights d. checking the rear-view mirror 12. What do the rays in a ray diagram show? LOWs1 13. Explain how a Global Positioning System works. LOWs3 14. What happens to reflected photons in a helium-neon laser? CRITICAL THINKING 15. Why is a photograph of a hologram different from the hologram itself? LOWs3 Holt Science and Technology 53 Light and Our World

3 Chapter Test B continued 16. You are at a carnival funhouse looking in a mirror. No matter how far you stand away from the mirror, your image is upright and small. Into what type of mirror are you looking? Explain your reasoning. LOWs1 17. Explain why there are not corrective lenses for color deficiency as there are for nearsightedness and farsightedness. LOWs2 INTERPRETING GRAPHICS Use this diagram to answer questions 18 and 19. Image Object Focal point Mirror 18. Describe the image formed in the diagram. LOWs1 19. If the object in the diagram were moved closer to the mirror, how would the image change? LOWs1 Holt Science and Technology 54 Light and Our World

4 Chapter Test B continued CONCEPT MAPPING 20. Use the following terms to complete the concept map below. short edges concave lens convex lens center long Vision Problems may include farsightedness nearsightedness in which the eye is too in which the eye is too a. d. which is corrected by placing a which is corrected by placing a b. e. that refracts light toward its that refracts light toward its c. f. in front of the eye Holt Science and Technology 55 Light and Our World

5 TEACHER RESOURCE PAGE SECTION: LIGHT AND SIGHT 2. D 3. C 4. A 5. D 6. C 7. A 8. C SECTION: LIGHT AND TECHNOLOGY 2. B 3. C 4. B 5. B 6. D 7. A 8. F 9. E 10. C Chapter Test A 1. A 2. C 3. B 4. A 5. C 6. B 7. D 8. D 9. B 10. A 11. A 12. B 13. D 14. C 15. A 16. D 17. B 18. C 19. E 20. A 21. F 22. C 23. D 24. A 25. B Chapter Test B 1. nearsightedness 2. real 3. plane mirror 4. convex lens 5. concave mirror 6. C 7. D 8. B 9. D 10. B 11. C 12. The rays in ray diagrams show changes in the direction light travels after being reflected by mirrors or refracted by lenses. 13. Answers will vary. Sample answer: The network of 27 Global Positioning System satellites continuously orbit Earth twice a day. Each satellite transmits a different radio signal. The signals from at least four satellites at one time are picked up by a GPS receiver on Earth. The receiver uses the signals to measure positions on Earth s surface to find an exact location. 14. Answers will vary. Sample answer: Many stimulated emissions create photons. Photons are reflected off plane mirrors at either end of the tube. As the photons increase, the lights get brighter. Some photons escape from the partially coated mirror at one end of the tube, and form a laser light beam. 15. Answers will vary. Sample answer: A hologram allows a person to see an image from different angles, while a photograph allows a person to see an image from only one angle. A photograph stores the image on the surface of the film, but the the holographic image appears in front of or behind the film. 16. Answers will vary. Sample answer: I am looking at a convex mirror. Convex mirrors always form virtual, upright, small images. 17. Lenses move the focal point of light entering the eye, but they cannot affect how cones in the retina react to that light. 18. The image is upside down, is smaller and is a real image. Holt Science and Technology 95 Light and Our World

6 TEACHER RESOURCE PAGE 19. The image would be right side up, and would be a virtual image. 20. a. short; b. convex lens; c. center; d. long; e. concave lens; f. edges Chapter Test C 2. B 3. B 4. C 5. A 6. A 7. D 8. C 9. B 10. D C 13. A 14. plane mirror 15. concave mirror 16. cornea 17. farsightedness 18. nearsightedness 19. color deficiency 20. C 21. A 22. D 23. B Standardized Test Preparation READING Passage 1 1. D 2. H 3. D Passage 2 1. A 2. G 3. D INTERPRETING GRAPHICS 2. F 3. B MATH 2. I 3. C Vocabulary Activity ACROSS 1. concave 4. plane 5. real 6. farsighted 8. pupil 9. lens 10. retina 12. radiation 14. polarized 17. coherent 21. laser 22. fiber 23. amplification 24. nearsighted 25. hologram DOWN 1. convex 2. cone 3. virtual 7. aperture 11. focal 13. iris 15. optical 16. rod 18. thicker 19. mirror 20. cornea SciLinks Activity 1. Answers will vary. Sample answer: A periscope is a tube or box that allows you to see around corners, walls, or around other obstacles. Periscopes have two mirrors mounted inside that reflect images to your eye. Submarines have periscopes that allow them to see what is happening above the surface when they are below water level. 2. Answers will vary. Sample answer: Visible white light that is directed onto the surface of a mirror at an angle (incident) is reflected back into space by the mirror surface at another angle (reflected) that is equal to the incident angle. The type of reflection that is seen in a mirror depends upon the mirror s shape and, in some cases, how far away from the mirror the object being reflected is positioned. Holt Science and Technology 96 Light and Our World

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