CHAPTER 17 REFLECTION & MIRRORS
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1 Physics Name Hour Physics Approximate Timeline Students are expected to keep up with class work when absent. CHAPTER 17 REFLECTION & MIRRORS Day Plans for the day Assignments for the day Reflection from Plane Mirrors o Law of Reflection Assignment 17.0 & 17.1Read section(s) 17.2 o Smooth & Rough Surfaces Specular & Diffuse Reflection o Objects & Plane Mirrors Images o Properties of Plane Mirror Images Image distance Image size Image orientation Real vs. Virtual Images Curved Mirrors o Concave Mirrors aka Positive Mirror / Converging Mirror o Graphical Method of Finding an Image o Mathematical Method of Finding an Image o Magnification o Virtual Images Curved Mirrors Assignment 17.2 o Convex Mirrors aka Negative Mirror / Diverging Mirror o Graphical Method of Finding an Image o Mathematical Method of Finding an Image o Magnification o Virtual Images 4 Mirror Lab 5 Work on Lab Report 6 Review for Chapter 17 Test 7 Chapter 17 Test Read section(s) 18.1
2
3 Physics Name Hour Study Guide Chapter 17 Quizzes Quiz 17.1 Reflection from Plane Mirrors 1. State the law of reflection. 2. When discussing reflection all angles should be measured from the. 3. Explain the difference between specular reflection and diffuse reflection. 4. Consider the properties of images formed in plane mirrors and answer the following. a. Compare the object distance and the image distance. b. Compare the object size and the image size. c. Describe the image orientation. d. Can the image seen in a plane mirror be focused on a screen? Quiz 17.2 Curved Mirrors 5. A spherical concave mirror has a radius of curvature equal to 20.0 cm. What is the focal length of this mirror? 6. When using the graphical method of finding the image formed by a concave mirror: a. Ray 1 is drawn parallel to the principle axis until it strikes the mirror and is then reflected back through the. b. Ray 2 is drawn through the focal point until it strikes the mirror and is then reflected back. 7. A spherical concave mirror produces defects in the image. These defects are called. 8. What type (shape) of concave mirror eliminates the defects referred to in the previous question? 9. Write the mirror equation. 10. Write the equation used to find the magnification of an image. 11. Under what conditions will a concave mirror produce: a. a real image? b. a virtual image? 12. Under what conditions will a convex mirror produce: a. a real image? b. a virtual image? 13. Solve problems involving curves mirrors.
4 Study Guide Chapter 17 Test At the completion of chapter 17 you should 1. Know the definitions of the following terms. a. Specular (regular) Reflection b. Diffuse Reflection c. Plane Mirror d. Object e. Real Image f. Virtual Image g. Concave Mirror h. Principle Axis i. Focal Point j. Focal Length k. Spherical Aberration l. Magnification m. Convex Mirror 2. Understand and explain the difference between specular (regular) reflection and diffuse reflection. 3. Understand and use the Law of Reflection. 4. Understand how images are formed in a plane mirror. 5. Describe the characteristics of images formed by plane mirrors. 6. Understand and explain the difference between real images and virtual images. 7. Understand how images are formed by a concave mirror. 8. Describe the characteristics of images formed by concave mirrors. 9. Understand how images are formed by a convex mirror. 10. Describe the characteristics of images formed by convex mirrors. 11. Calculate the image position and image size for all types of mirrors. 12. Calculate the magnification in curved mirrors.
5 Physics Name Hour Assignment 17.0 Vocabulary Define each of the following terms. 1. Specular (regular) Reflection 2. Diffuse Reflection 3. Plane Mirror 4. Object 5. Real Image 6. Virtual Image 7. Concave Mirror 8. Principle Axis 9. Focal Point 10. Focal Length
6 11. Spherical Aberration 12. Magnification 13. Convex Mirror
7 Physics Name Hour Assignment 17.1 Reflection from Plane Mirrors Short Answer: Answer each question in the space provided. Write or print clearly. IF I CAN T READ IT, IT S WRONG. 1. How does specular reflection differ from diffuse reflection? 2. What is meant by the phrase normal to the surface? 3. Where is the location of the image produced by a plane mirror? 4. Describe the properties of the image produced by a plane mirror? 5. A student believes that very sensitive photographic film can detect a virtual image. The student puts photographic film at the location of a virtual image. A) Does this attempt succeed? B) Explain. 6. How can you prove to someone that an image is a real image? 7. Why is it desirable that the pages of a book be rough rather than smooth and glossy?
8 Problems: Solve each of the following problems. Show all work. Circle your answer expressed with the correct number of significant figures and units. 8. A ray of light strikes a plane mirror at an angle of 38º to the normal. What is the angle that the reflected angle makes with the normal? 9. A ray of light strikes a plane mirror at an angle of 53º to the normal. A) What is the angle of reflection? B) What is the angle between the incident ray and the reflected ray? 10. Penny wishes to take a picture of her image in a plane mirror. If the camera is 1.2 meters in front of the mirror, at what distance should the camera lens be focused?
9 Physics Name Hour Assignment 17.2 Curved Mirrors Short Answer: Answer each question in the space provided. Write or print clearly. IF I CAN T READ IT, IT S WRONG. 1. An object produces a virtual image in a concave mirror. Where is the object located? 2. What is the equation relating focal point, object position, and image position? 3. What is the relationship between the center of curvature and the focal length of a concave mirror? 4. If you know the image position and object position relative to a curved mirror, how can you determine the mirror s magnification? 5. Why are convex mirrors used as rearview side view mirrors on the passenger side of cars and trucks? 6. Why is it impossible for a convex mirror to form a real image? 7. Locate and describe the physical properties of the image produced by a concave mirror when the object is located at the center of curvature. 8. An object is located beyond the center of curvature of a spherical concave mirror. Locate and describe the physical properties of the image. 9. You have to order a large concave mirror for a telescope that produces high quality images. Should you order a spherical mirror or a parabolic mirror? Explain.
10 10. List all the possible arrangements in which you could use a spherical mirror, either concave or convex, to form a real image. 11. List all the possible arrangements in which you could use a spherical mirror, either concave or convex, to form an image that is smaller than the object. 12. The outside rearview mirrors of cars often carry the warning Objects in mirror are closer than they appear. A) What kind of mirrors are these and B) what advantage do they have? Problems: Solve each of the following problems. Show all work. Circle your answer expressed with the correct number of significant figures and units. 13. A concave mirror has a focal length of 10.0 cm. What is its radius of curvature? 14. An object located 18 cm from a convex mirror produces a virtual image 9 cm from the mirror. What is the magnification of the image? 15. A boy is standing near a convex mirror in a fun house at a fair. He notices that his image appears to be 0.60 m tall. If the magnification of the mirror is 1/3, what is the boy s height?
11 Physics Name Hour 16. Describe the image produced by the object in the figure below. (Do the ray tracing and then describe the image produced.) 17. Find the image position and height for the object shown in the figure below. 18. How far does the image of a car appear behind a convex mirror, with a focal length of -6.0 m, when the car is 10.0 m from the mirror?
12 19. An object is 30.0 cm from a concave mirror with 15.0 cm focal length. The object is 1.8 cm tall. Find: A) The image location. B) The image size. C) The image orientation. D) Is the image real or virtual? E) The magnification of the image.
13 Physics Name Hour 20. A dentist used a small mirror with a radius of curvature equal to 40 mm to locate a cavity in a patient s tooth. The cavity is 2 mm in diameter. If the mirror is concave and is held 16 mm from the tooth, Find: A) The image location. B) The image size. C) The image orientation. D) Is the image real or virtual? E) The magnification of the image.
14 21. Shiny spheres that are placed on pedestals on a lawn are convex mirrors. One such sphere has a diameter of 40.0 cm. A 12 cm tall robin sits in a tree that is 1.5 m from the sphere. Find: A) The image location. B) The image size. C) The image orientation. D) Is the image real or virtual? E) The magnification of the image.
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