Practice Test Light Equations Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which colour of light has the shortest wavelength? a. red c. green b. blue d. violet 2. How would you increase the size of the shadows on the screen? a. Move the solid objects closer to the light source. b. Move the light source away from the solid objects. c. Move the solid objects closer to the screen. d. Decrease the size of the solid objects. 3.
The diagram above illustrates which of the following? a. chromatic aberration c. myopia b. spherical aberration d. hyperopia 4. Where will the image of this object be located? a. at F b. between F and C c. between F and V d. at C 5. Which is an example of incandescence? a. a firefly s light b. a laser c. a glowing piece of charcoal d. an LED 6. What is a normal line? a. A line that is perpendicular to the angle of incidence, b. A line that is perpendicular to the angle of reflection. c. A line that is perpendicular to the reflecting surface. d. A line that is parallel to the angle of incidence. 7.
The diagram above demonstrates which of the following optical phenomena? a. reflection c. mirage b. sundogs d. refraction 8. In the following diagram, i is the a. angle of incidence. c. angle of refraction. b. angle of reflection. d. normal. Use the accompanying table to answer the following question(s).
9. In which of the following substances is the speed of light greatest? a. diamond c. Lucite b. zircon d. flint glass 10. In which of the following substances is the speed of light slowest? a. diamond c. Lucite b. zircon d. flint glass 11. Water s index of refraction is 1.33. The speed of light in water is a. 2.26 10 8 m/s b. 1.33 10 8 m/s c. 4.43 10 8 m/s d. 3.24 10 8 m/s 12. The sparkle of a diamond is an effect of a. refraction b. partial refraction and reflection c. total internal reflection d. none of the above 13. The critical angle is the angle of incidence that produces a refracted angle a. equal to the incident angle b. of 180 degrees c. of 90 degrees d. greater than the incident angle 14. A man is in his late 40s. His eye condition is described in this diagram. What name does the doctor give for this condition?
a. near-sightedness c. presbyopia b. far-sightedness d. accommodation 15. The film in a camera and the in an eye perform a similar function. a. retina c. lens b. optic nerve d. iris 16. When making a ray diagram, what is the minimum number of rays you need to draw in order to locate an image? a. 1 b. 2 c. 3 d. 4 17. A camera takes light from large, distant objects and forms what kind of image? a. small, real, inverted b. enlarged, real, inverted c. enlarged, virtual, inverted d. enlarged, virtual, upright 18. Where will the image form in this diagram? a. between F and the lens b. between F and c. to the left of F d. No image will form.
Matching Identify the term that best matches each label on the reflection diagram. a. normal d. incident ray b. angle of incidence e. reflected ray c. angle of reflection 19. i 20. ii 21. iii 22. iv 23. v Match each section of the electromagnetic spectrum with its name. a. a b. b c. c d. d e. e f. f g. g 24. visible light 25. X-rays 26. radio waves
27. gamma rays 28. microwaves 29. infrared light 30. ultraviolet light Match each vocabulary term with its definition. a. the separation of white light into its constituent colours b. the angle of incidence that results in an angle of refraction of 90? c. the ratio of the speed of light in a vacuum to the speed of light in a medium d. the level at which an object appears to be due to refraction of light e. a virtual image that forms as a result of refraction and total internal reflection in Earth s atmosphere f. the bending of light when it travels from one medium into another g. the situation when the angle of incidence is greater than the critical angle h. the angle between the refracted ray and the normal i. an optical device in which the emergent ray is parallel to the incident ray 31. refraction 32. angle of refraction 33. index of refraction 34. critical angle 35. total internal reflection 36. retro-reflector 37. apparent depth 38. mirage 39. dispersion Short Answer 40. Use the laws of reflection to locate and draw the reflected image.
41. A convex security mirror in a hardware store has a focal length of 0.50 m. A boy who is 1.5 m tall is standing 4.0 m in front of the mirror. a) Calculate the image distance. Show your work. b) Calculate the image height. Show your work. Use this diagram to help you answer the following question(s). cm. 42. A 15-cm long pencil is located 25 cm from a concave mirror with focal length 20 What will be the distance of the image from the mirror? 43. What will be the height of the image in the example above? image? 44. What does SALT stand for? How does it help you describe the properties of an Use the accompanying table to answer the following question(s).
45. Calculate the speed of light in carbon disulfide. 46. How much faster is the speed of light in a vacuum, compared to the speed of light in water? 47. Explain what is meant by the term total internal reflection and when this phenomenon occurs. 48. Describe the meaning of the term partial reflection and refraction. 49. Use the diagram to explain how a mirage forms. 50. What are the two different types of telescopes, and how do they differ? 51. Draw a ray diagram to show the image of the object that is formed by the converging lens.
Problem 52. Complete the diagram above by doing the following. Draw a ray diagram to show the image seen. Use solid lines to represent the light rays. Use dotted lines to represent any lines that extend beyond the mirror to the image. Include direction arrows to show the light's path. Label the mirror, image, and object. What do the direction arrows show? 53. A concave mirror has a focal length of 10 cm. An object with a height of 5 cm is placed 20 cm from the mirror. a) Calculate the image distance. b) Calculate the image height.
Essay 54. Border guards use convex mirrors to inspect underneath cars. Explain why convex mirrors are more useful than plane mirrors for this purpose. Practice Test Light Answer Section MULTIPLE CHOICE 1. ANS: D PTS: 1 OBJ: 4-1 STA: E3.2 TOP: 10.1 MSC: K/U 2. ANS: A PTS: 1 OBJ: 4-1 STA: E2.2 TOP: 10.2 MSC: T/I 3. ANS: B PTS: 1 OBJ: 4-1 STA: E3.3 TOP: 10.3 MSC: K/U 4. ANS: D PTS: 1 REF: A OBJ: 11.9 Images in Curved Mirrors LOC: E3.3 MSC: Solve a Problem 5. ANS: C PTS: 1 REF: K/U OBJ: 11.2 How Is Light Produced? LOC: E3.1 MSC: What Do You Understand? 6. ANS: C PTS: 1 REF: K/U OBJ: 11.4 The Ray Model of Light LOC: E3.3 MSC: What Do You Understand? 7. ANS: D PTS: 1 OBJ: 4-1 STA: E3.8 TOP: 11.3 MSC: K/U 8. ANS: A PTS: 1 OBJ: 4-1 STA: E2.1 TOP: 11.1 MSC: K/U 9. ANS: C PTS: 1 OBJ: 4-1 STA: E2.6 TOP: 11.1 MSC: T/I 10. ANS: A PTS: 1 OBJ: 4-1 STA: E2.6 TOP: 11.1 MSC: T/I 11. ANS: A PTS: 1 REF: T/I OBJ: 12.4 The Index of Refraction LOC: E2.6 MSC: Solve a Problem 12. ANS: C PTS: 1 REF: A OBJ: 12.5 Total Internal Reflection LOC: E3.4 MSC: What Do You Remember? 13. ANS: C PTS: 1 REF: K/U OBJ: 12.5 Total Internal Reflection LOC: E3.7 MSC: What Do You Remember? 14. ANS: B PTS: 1 OBJ: 4-2 STA: E1.2 E2.1 TOP: 12.3 MSC: K/U 15. ANS: A PTS: 1 OBJ: 4-1 STA: E1.1 TOP: 12.3 MSC: K/U 16. ANS: B PTS: 1 REF: K/U OBJ: 13.3 Images in Lenses LOC: E3.5 MSC: What Do You Remember? 17. ANS: A PTS: 1 REF: K/U OBJ: 13.5
Lens Applications LOC: E3.6 MSC: What Do You Remember? 18. ANS: D PTS: 1 REF: T/I OBJ: 13.1 Lenses and the Formation of Images LOC: E3.5 MSC: Create and Evaluate MATCHING 19. ANS: D PTS: 1 OBJ: 4-1 STA: E3.3 TOP: 10.2 MSC: K/U 20. ANS: B PTS: 1 OBJ: 4-1 STA: E3.3 TOP: 10.2 MSC: K/U 21. ANS: A PTS: 1 OBJ: 4-1 STA: E3.3 TOP: 10.2 MSC: K/U 22. ANS: C PTS: 1 OBJ: 4-1 STA: E3.3 TOP: 10.2 MSC: K/U 23. ANS: E PTS: 1 OBJ: 4-1 STA: E3.3 TOP: 10.2 MSC: K/U 24. ANS: D PTS: 1 REF: K/U OBJ: 11.1 What Is Light? LOC: E3.2 MSC: What Do You Remember? 25. ANS: F PTS: 1 REF: K/U OBJ: 11.1 What Is Light? LOC: E3.2 MSC: What Do You Remember? 26. ANS: A PTS: 1 REF: K/U OBJ: 11.1 What Is Light? LOC: E3.2 MSC: What Do You Remember? 27. ANS: G PTS: 1 REF: K/U OBJ: 11.1 What Is Light? LOC: E3.2 MSC: What Do You Remember? 28. ANS: B PTS: 1 REF: K/U OBJ: 11.1 What Is Light? LOC: E3.2 MSC: What Do You Remember? 29. ANS: C PTS: 1 REF: K/U OBJ: 11.1 What Is Light? LOC: E3.2 MSC: What Do You Remember? 30. ANS: E PTS: 1 REF: K/U OBJ: 11.1 What Is Light? LOC: E3.2 MSC: What Do You Remember? 31. ANS: F PTS: 1 REF: K/U OBJ: 12.1 What Is Refraction? LOC: E2.1 MSC: What Do You Remember? 32. ANS: H PTS: 1 REF: K/U OBJ: 12.1 What Is Refraction? LOC: E2.1 MSC: What Do You Remember? 33. ANS: C PTS: 1 REF: K/U OBJ: 12.4 The Index of Refraction LOC: E2.1 MSC: What Do You Remember?
34. ANS: B PTS: 1 REF: K/U OBJ: 12.5 Total Internal Reflection LOC: E2.1 MSC: What Do You Remember? 35. ANS: G PTS: 1 REF: K/U OBJ: 12.5 Total Internal Reflection LOC: E2.1 MSC: What Do You Remember? 36. ANS: I PTS: 1 REF: K/U OBJ: 12.5 Total Internal Reflection LOC: E2.1 MSC: What Do You Remember? 37. ANS: D PTS: 1 REF: K/U OBJ: 12.7 Phenomena Related to Refraction LOC: E2.1 MSC: What Do You Remember? 38. ANS: E PTS: 1 REF: K/U OBJ: 12.7 Phenomena Related to Refraction LOC: E2.1 MSC: What Do You Remember? 39. ANS: A PTS: 1 REF: K/U OBJ: 12.7 Phenomena Related to Refraction LOC: E2.1 MSC: What Do You Remember? SHORT ANSWER 40. ANS: Look for the following in student drawings: points in the reflection should be equidistant from the four points on the original "F" on opposite side of mirror. PTS: 4 OBJ: 4-1 STA: E3.3 TOP: 10.2 MSC: C 41. ANS:
a) The image is 0.44 m from the lens. b) The image height is about 0.17 m. PTS: 4 OBJ: 4-1 STA: E3.3 TOP: 10.4 MSC: K/U 42. ANS: 100 cm PTS: 2 OBJ: 4-1 STA: E3.3 TOP: 10.3 MSC: T/I 43. ANS: 60 cm (inverted or negative) PTS: 2 OBJ: 4-1 STA: E3.3 TOP: 10.3 MSC: T/I 44. ANS: SALT stands for Size, Attitude, Location, and Type. Size tells you the relative size of the image compared to the object. Attitude signifies whether the image is upright or inverted. Location tells where the image is located with respect to C, F, and V. Type tells whether the image is real or virtual. These attributes precisely identify what the image is and where it is located. PTS: 1 OBJ: 11.7 Images in a Plane Mirror LOC: E3.2 MSC: Reflect on Your Learning 45. ANS: n = 1.632
The speed of light in carbon disulfide is 1.84 «10 8 m/s. PTS: 1 OBJ: 4-1 STA: E3.7 TOP: 11.1 MSC: K/U 46. ANS: 1.33 times faster PTS: 1 OBJ: 4-1 STA: E3.7 TOP: 11.1 MSC: T/I 47. ANS: Total internal reflection is the phenomenon in which incident light is not refracted but is entirely reflected back from the boundary. It occurs when light travels from a medium in which its speed is lower to a medium in which its speed is higher. PTS: 2 OBJ: 4-1 STA: E2.1 TOP: 11.2 MSC: C 48. ANS: Partial reflection and refraction a phenomenon in which some of the light that is travelling from one medium into another is reflected and some is refracted at the boundary between the media PTS: 2 OBJ: 4-1 STA: E2.1 TOP: 11.2 MSC: T/I 49. ANS: Sample answer: Light from an object in the sky refracts more and more as it passes through warmer and warmer air close to the ground. Finally, total internal reflection occurs, and the light bends so it now actually moves upward. The eye sees a virtual image the light as if it were coming from the ground rather than the sky. PTS: 1 REF: C OBJ: 12.7 Phenomena Related to Refraction LOC: E3.8 MSC: What Do You Understand? 50. ANS: refracting and reflecting In a refracting telescope, light from a distant object is collected and focussed by a convex lens. A reflecting telescope uses a concave mirror to collect and focus rays of light from a distant object. PTS: 4 OBJ: 4-2 STA: E1.2 TOP: 12.3 MSC: K/U 51. ANS: Diagram includes all of the following: