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$Math Alignment Project - Grand Erie District School First Class Web ...$

11.1 CHECK and REFLECTKey Concept Review1. Describe the law of reflection as arelationship between the angle of incidence,the angle of reflection, and the normal.2. Describe the kinds of images that can beformed by plane mirrors.3. (a) What type of mirror produces onlydiverging rays?(b) What type of mirror can produce bothconverging and diverging rays?4. Describe what kind of mirror you would useif you needed to view a large, spread-out areain a small mirror.5. Compare the shapes of convex and concavemirrors. How are they similar, and how dothey differ?6. What kind of images do convex mirrors form?7. What are three uses for convex mirrors?8. A lighted object is placed at the focal point ofa concave mirror. Describe the light raysreflecting off the mirror.Connect Your Understanding13. Use a ray diagram with five rays to show howa car headlight uses a concave mirror to directlight.14. Draw the following ray diagram: three rays,travelling generally left to right, converge10 cm away from a concave mirror and arereflected away from the mirror as parallelrays.15. Draw a ray diagram to determine the positionof an image formed by a concave mirror thathas a focal length of 3.0 cm and a 2.0 cmobject positioned 6.0 cm from the mirror.16. If you can see someone in a mirror, can thatperson see you? Explain why or why not. Usea ray diagram if necessary.17. Draw a view from above of an arrangement ofmirrors that would allow you to see the backof your head. Mark the angles of incidenceand reflection on your diagram.18. Does diffuse reflection, shown below, followthe law of reflection? Explain why it does ordoes not.9. Describe how the positions of a mirror,incident ray, reflected ray, and normal arerelated.10. How does your image in a mirror comparewith looking directly at yourself?11. A bacterium has a length of 5.5 10 –6 m butseen through a powerful microscope appearsto be 1.2 10 –3 m. What is the magnificationof the microscope?12. A virtual image is produced by a convexmirror that is 1.60 cm from the mirror. If themagnification is 0.20, how far from themirror is the object?Question 18Reflection19. (a) Describe one idea you found easy to learnin this section.(b) Why do you think it was easy to learn?(c) Describe one idea you found difficult tounderstand in this section.(d) What did you do to help yourselfunderstand it?For more questions, go to ScienceSource.Ray diagrams model the behaviour of light in mirrors and lenses.433
11.2The Refraction of LightHere is a summary of what youwill learn in this section:• Refraction is the bending oflight as it passes betweenmedia that have differentrefractive indices.• Refraction occurs due to thechange in the speed of light indifferent media.• The index of refraction of amedium is the ratio of thespeed of light in a vacuumcompared to the speed of lightin the medium.• As light passes at an anglefrom a less dense medium intoa more dense medium, thelight ray bends toward thenormal.• Snell’s law relates the indicesof refraction of a medium to theangle of incidence andreflection.Figure 11.27 Laser light is transmitted along optical fibres for use in surgery.Fibre OpticsOne of the most important properties of light is that it tends to travel instraight lines. If you need light to bend around a corner or to shine intoa difficult-to-reach place, you might want to use optical fibres. Anoptical fibre is a thin, transparent glass tube that can transmit lighteven around corners (Figure 11.27). This is because the light in a fibreoptics tube cannot escape until it reaches the end of the tube.How does an optical fibre conduct a light ray around a corner?Imagine a long, curved tunnel whose walls, floor, and ceiling are linedwith mirrors. If you were to shine a laser beam into the tunnel, thebeam of light would change direction each time it reflected from amirror and would make it all the way to the end of the tunnel. This isexactly what happens on the inside of the optical fibre. The light rayreflects off the inside of the walls of the glass fibre. When the thin glassfibre bends around a corner, the light ray goes around the cornerthrough a series of reflections.434 UNIT D Light and Geometric Optics
Page 1 and 2: 11Ray diagrams model the behaviour
Page 3: 11.1MirrorsHere is a summary of wha
Page 6 and 7: Using the Law of ReflectionThe law
Page 8 and 9: Concave MirrorsA concave mirror, al
Page 10 and 11: Solar OvensA solar oven, also calle
Page 12 and 13: Example Problem 11.3An electron mic
Page 14 and 15: Uses for Convex MirrorsIf you were
Page 16 and 17: D14 Skill Builder ActivityDrawing R
Page 18 and 19: D15 Inquiry Activity (continued)Fig
Page 22 and 23: We use fibre optics systems to tran
Page 24 and 25: A ray of light is electromagnetic r
Page 26 and 27: How Light RefractsYou can picture t
Page 28 and 29: Snell’s LawThe phenomenon of refr
Page 30 and 31: At a certain angle, called the crit
Page 32 and 33: D19 Inquiry ActivityIndex of Refrac
Page 34 and 35: 11.2 CHECK and REFLECTKey Concept R
Page 36 and 37: Night vision goggles use lenses to
Page 38 and 39: Concave LensesA diverging lens is s
Page 40 and 41: Forming a Real ImageConvex lenses a
Page 42 and 43: Keep in mind the following points w
Page 44 and 45: Example Problem 11.11A camera with
Page 46 and 47: D24 Quick LabFocal LengthPurposeTo
Page 48 and 49: D26 Inquiry ActivityIdentifying the
Page 50 and 51: SCIENCEeverywhereSelf-AdjustingGlas
Page 52: 18. A student looks at the letters

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