Chapter 11.pdf

More documents

Recommendations

Info

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

11.2 CHECK and REFLECTKey Concept Review1. When is light travelling at its fastest?2. What is dispersion?3. Under what conditions can you slow downlight and then speed it up again?4. Describe how light changes its direction whenmoving from one medium to another.5. Copy the following diagram into yournotebook. Label all the lines and angles.Connect Your Understanding11. Determine the refractive index of a medium ifthe speed of light slows to 1.2 10 8 m/s.12. Jade has a refractive index of 1.61. If lightapproaches the gem at an angle of 80.0°, whatis the angle of refraction?13. A student is given a clear material to identify.She shines a laser at the surface of thematerial at an angle of 25.0°. The angle of therefracted ray is 16.7°. What material is it?14. Calculate the index of refraction of a materialif the angle of incidence is 60° and the angleof refraction is 50°.15. A light ray passes from a vacuum into asubstance where its speed is 2.26 10 8 m/s.What is the substance?Question 56. What property of a medium is given by itsindex of refraction?7. Through which medium does light pass morequickly, one with a refractive index of 2.0 orone with a refractive index of 3.0?8. (a) What is total internal reflection?(b) When does it occur?9. (a) What is the formula for Snell’s law?(b) Explain how you would calculate thechanging speed of light using Snell’s law.10. Describe how Snell’s law can be used todescribe the bending of light toward and awayfrom the normal.16. A super-dense material called a“Bose-Einstein condensate” has a refractiveindex of 1.76 10 7 . What is the speed oflight in this material?17. How do reflection and refraction affect lightsimilarly?18. How do reflection and refraction affect lightdifferently?19. Why is it not possible to have an index ofrefraction less than 1.0?Reflection20. (a) What do you think is the most interestinginformation you learned in this section?(b) How does this information connect withwhat you already knew about the subject?21. What scientific terms do you understandbetter now than you did before you read thissection?For more questions, go to ScienceSource.Ray diagrams model the behaviour of light in mirrors and lenses.447
11.3LensesHere is a summary of what youwill learn in this section:• Lenses refract light in usefulways to form images.• Concave lenses, which causelight to diverge, are used inmulti-lens systems to helpproduce images.• Convex lenses cause light toconverge and can be used inmagnifying glasses or to projectimages on a screen.• When the object is farther awayfrom a convex lens than thefocal point, the image is realand inverted.• When the object is closer to thelens than the focal point, theimage is virtual and upright.Figure 11.45 Police officers using night vision goggles while patrolling along theSt. Lawrence RiverSeeing in the DarkImagine taking to the skies in a helicopter over the forests of northernOntario. It is the middle of the night, and all you see out the window istotal blackness. Your task is to fly to a remote forest location and rescuea team of firefighters needing emergency evacuation. Or pictureyourself on night patrol watching along the shores of the St. LawrenceRiver (Figure 11.45). Would you be ready for such a mission?In addition to excellent training, it helps to have good equipment,including radar, radio, lights, and night vision goggles (Figure 11.46).Modern night vision goggles are so sensitive that the tiny amounts ofstarlight reflecting off forests can be amplified to levels visible to pilotsand rescue staff to give a clear view of the countryside. With theseultra-sensitive devices, you can literally fly and search by starlight.Figure 11.46 Night vision goggles448 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 20 and 21: 11.1 CHECK and REFLECTKey Concept R
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 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

Chapter 11.pdf

Create successful ePaper yourself

Delete template?

Save as template?