is10_sb_unit_d

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D10 Quick Lab Some Properties of Light Purpose To use the behaviour of light to classify materials Materials & Equipment • ray box • wax paper • block of wax • block of wood • clear triangular glass prism CAUTION: Do not shine bright light into anyone’s eyes. Incandescent light sources can become very hot. Do not touch the bulbs or block air flow around the light bulb. Procedure 1. Make a table of observations using the headings below. Give your table a title. Material Reflection (regular, diffuse or none) • plane mirror • frosted glass • bubbles from bubbleblowing liquid •DVD • paper Other Properties (transparent, translucent, opaque, etc.) 2. Hold the wax paper upright on your desk while your partner next to you shines a light on it. Observe whether it reflects the light and, if so, whether the reflection is regular or diffuse. Record your observations in the second column of the table. 3. While the light is still shining on the wax paper, look at the other side of it to determine if it is translucent, transparent, or opaque. Record your observations in the third column of the table. 4. If the wax paper exhibits any unexpected properties, indicate “other” in the third column and briefly describe the properties. 5. Repeat steps 2 through 4 for all the other materials in the table. Questions 6. Which materials exhibited the following properties? (a) opaque (b) transparent (c) translucent (d) reflective (e) regular reflection (f) diffuse reflection 7. (a) Which materials exhibited other properties? (b) Describe each property. 8. Compare how the prism interacted with light to how the DVD interacted with light. (a) How were they similar? (b) How were they different? 9. How can you use the behaviour of light to classify materials? 10. Figure 10.45 is a micrograph showing a paper towel at a magnification of 150 at 10 cm. What does the micrograph show about the way that a paper towel reflects light? Figure 10.49 Photomicrograph of the surface of a paper towel (magnification 150X) Light is part of the electromagnetic spectrum and travels in waves. 407
D11 Inquiry Activity Shadows and Rays Question How can you use ray diagrams to predict the size and shape of shadows created by opaque objects? Materials & Equipment • a bright light source, such as a ray box, flashlight, or overhead projector • triangle, rectangle, or similar shape cut from cardboard • retort stand and clamp • chart paper to trace on CAUTION: Do not shine bright light into anyone’s eyes. Incandescent light sources can become very hot. Do not touch the bulbs or block air flow around the light bulbs. Procedure 1. Work with a partner. Tape a sheet of chart paper to the wall. Set up the light source about 2 m from the wall, shining toward the paper. 2. Cut a triangle or other shape from cardboard, and calculate its area. Mount the triangle on the retort stand, and place it between the light and the wall, 1 m from the wall. Call this position the reference position (Figure 10.50). Figure 10.50 Step 2 0 m 1 m 2 m 3. Trace the shadow of the triangle on the chart paper. Calculate the area of the shadow you have traced. 408 UNIT D Light and Geometric Optics • adhesive tape • pencil/marker • material to simulate light rays, such as drinking straws attached end to end, metre sticks, or wooden dowels Skill Reference 2 4. Create several straight simulated light rays. Attach one end of the simulated rays to the light source and the other end to the edges of the shadow. The “light rays” should just touch the edge of your triangle as they pass. 5. Sketch the arrangement of the light source, simulated light rays, triangle, and shadow. Record the distances separating the light source, triangle, and shadow. 6. Move the triangle closer or farther away from the wall. Adjust your “light rays” so that they still touch the triangle as they pass. Predict whether the shadow size will increase or decrease based on the new locations of the rays. 7. Test your prediction by turning on the light source. Record the new distances and areas. 8. Repeat steps 6 and 7 to create two sets of data: one with your triangle placed closer to the light source than the reference position, and one with your triangle placed farther from the light source than the reference position. Analyzing and Interpreting 9. What can you generally (qualitatively) say about the distance between a light source and an object and the shadow it casts? 10. What can you say about the edge of the shadow on your paper when the object is farthest from the source compared with when it is closest to the source? Is it as well defined in both positions? Skill Practice 11. Would the same results be achieved if the object’s position stayed the same but the position of the light source changed? Explain. Forming Conclusions SKILLS YOU WILL USE ■ Observing and recording observations ■ Interpreting data/information to identify patterns or relationships 12. Describe how you can use ray diagrams to predict the size and shape of shadows created by opaque objects.
Page 1 and 2: UNIT D Light travels through colour
Page 3 and 4: Exploring These doctors are examini
Page 5 and 6: 0 Light is part of the electromagne
Page 7 and 8: 10.1 Here is a summary of what you
Page 9 and 10: During Reading Graphics Support Tex
Page 11 and 12: Uses of the Electromagnetic Spectru
Page 13 and 14: light source white light prism scre
Page 15 and 16: Figure 10.19 The subtractive theory
Page 17 and 18: DI Key Activity D4 Quick Lab Seeing
Page 21 and 22: WORDS MATTER “Incandescent” has
Page 23 and 24: During Reading Get the Picture Even
Page 25 and 26: Figure 10.36 Plasma screens use flu
Page 27 and 28: D7 Quick Lab Analyzing Light Source
Page 31 and 32: Figure 10.42 Light rays travel away
Page 33: Suggested Activities • • D10 Qu
Page 37 and 38: Investigating 410 UNIT D Light and
Page 39 and 40: 10 CHAPTER REVIEW ACHIEVEMENT CHART
Page 41 and 42: 11 Ray diagrams model the behaviour
Page 43 and 44: 11.1 Mirrors Here is a summary of w
Page 45 and 46: During Reading Diagrams Require Spe
Page 47 and 48: Suggested Activity • D16 Problem-
Page 49 and 50: 422 object ray 1 ray 2 image Figure
Page 51 and 52: Practice Problems 1. A microscope p
Page 53 and 54: Figure 11.16 Parallel light rays ap
Page 55 and 56: D13 Quick Lab Plane Mirror Reflecti
Page 57 and 58: DI Key Activity D15 Inquiry Activit
Page 59 and 60: D16 Problem-Solving Activity Laser
Page 63 and 64: Figure 11.30 The spoon appears to b
Page 65 and 66: Practice Problems 1. The speed of l
Page 67 and 68: Figure 11.36 This diamond is colour
Page 69 and 70: Suggested Activity • D19 Inquiry
Page 71 and 72: D18 Inquiry Activity Refraction Mea
Page 73 and 74: D20 Design a Lab Transmitting Light
Page 75 and 76: 11.3 Lenses Here is a summary of wh
Page 77 and 78: WORDS MATTER The word “lens” is
Page 79 and 80: object ray 2 F ray 1 image Figure 1
Page 81 and 82: Suggested Activity • D25 Inquiry
Page 83 and 84: Practice Problems 1. A convex lens
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D23 Skill Builder Activity Drawing
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D25 Inquiry Activity Convex Lens Im
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11.3 CHECK and REFLECT Key Concept
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11 CHAPTER REVIEW ACHIEVEMENT CHART
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2 Optical devices help us see farth
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12.1 Here is a summary of what you
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WORDS MATTER “Pupil” is derived
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Suggested Activity • D28 Inquiry
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(a) near-sightedness (b) near-sight
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(a) (b) Figure 12.17 (a) Loss of th
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D28 Inquiry Activity Sheep Eye Diss
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DI Key Activity CASE STUDY D29 STSE
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12.2 Here is a summary of what you
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Figure 12.24 This portable imaging
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Suggested STSE Activity • D34 Dec
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During Writing Evaluating Informati
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WORDS MATTER The word “laser” i
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Figure 12.39 Long rows of solar cel
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D33 STSE Decision-Making Analysis S
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12.2 CHECK and REFLECT Key Concept
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12 CHAPTER REVIEW ACHIEVEMENT CHART
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D UNIT • Electromagnetic spectrum
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D UNIT Task How Much Light Is Too M
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D UNIT Review Key Terms Review 1. C
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D UNIT Review (continued) 35. (a) D
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D UNIT Review (continued) 62. Descr
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