Light Mirrors and Lenses (3379.0K) - McGraw-Hill Higher Education

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7. Measure the distance of the card from the lens using the meterstick, andrecord this distance in the Image Distance column in your data table.8. Record in the third column of your data table whether the image is upright orinverted, and smaller or larger.9. Repeat steps 4 through 8 for object distances of 0.50 m and 0.25 m and recordyour data in your data table.Analyze Your Data1. Describe any observed relationship between the object distance, and theimage type.2. Identify the variables involved in determining the image type for aconvex lens.Conclude and Apply1. Explain how the image distance changedas the object distance decreased.2. Identify how the image changed as the objectdistance decreased.3. Predict what would happen to the size of theimage if the flashlight were much farther awaythan 1 m.Demonstrate this lab to a third-grade classand explain how it works. For more help,refer to the Science Skill Handbook.LAB 573
SOMETIMESGREATDISCOVERIESHAPPEN BYACCIDENT!EyeglassesInventorUnknown“It is not yet twenty years since the artof making spectacles, one of the mostuseful arts on Earth, was discovered.I, myself, have seen and conversed with theman who made them first.”This quote from an Italian monk datesback to 1306 and is one of the first historicalrecords to refer to eyeglasses. Unfortunately,the monk, Giordano, never actually namedthe man he met. Thus, the inventor of eyeglassesremains unknown.The mystery exists, in part, because differentcultures in different places used sometype of magnifying tool to improve theirvision. For example, a rock-crystal lens, madeby early Assyrians who lived 3,500 years agoin what is now Iraq, may have been used toimprove vision. About 2,000 years ago, theRoman writer Seneca looked through a glassglobe of water to make the letters appear biggerin the books he read. By the tenth century,glasses had been invented in China, butthey were used to keep away bad luck, not toimprove vision.In the mid 1400s in Europe, eyeglassesbegan to appear in paintings of scholars,clergy, and the upper classes—eyeglasseswere so expensive that only the rich couldafford them. In the early 1700s, for example,This Italian engraving from the 1600sshows some different types of glasses.glasses cost roughly $200, which is comparableto thousands of dollars today. By the mid-1800s, improvements in manufacturingtechniques made eyeglasses much lessexpensive to make, and thus this importantinvention became widely available to peopleof all walks of life.How Eyeglasses WorkEyeglasses are used to correct farsightednessand nearsightedness, as well as othervision problems. The eye focuses light rays toform an image on a region called the retinaon the back of the eye. Farsighted peoplehave difficulty seeing things close up becauselight rays from nearby objects do not convergeenough to form an image on the retina.This problem can be corrected by using convexlenses that cause light rays to convergebefore they enter the eye. Nearsighted peoplehave problems seeing distant objectsbecause light rays from far-away objects arefocused in front of the retina. Concave lensesthat cause light rays to diverge are used tocorrect this vision problem.Research In many parts of the world, people haveno vision care, and eye diseases and poor vision gountreated. Research the work of groups that bring eyecare to people.For more information, visitips.msscience.com/oopsThe Stapleton Collection/Bridgeman Art Library
Page 2 and 3: Start-Up ActivitiesBending LightEve
Page 4: Light Travels Through Space There i
Page 7 and 8: Figure 7 The three primarycolor pig
Page 9 and 10: Figure 9 A highly magnifiedview of
Page 11 and 12: Topic: Concave MirrorsVisit ips.mss
Page 13 and 14: Figure 14 A convex mirror is a mirr
Page 15 and 16: Refraction and Lenses■ Determine
Page 17 and 18: Figure 18 A convexlens forms an ima
Page 19 and 20: CladdingPlastic fiberLight rayFigur
Page 21 and 22: Forming an Imagewith a LensProcedur
Page 23 and 24: ObjectDiaphragmLensFigure 25 A came
Page 25: Goals■ Measure the imagedistance
Page 29 and 30: concave lens p. 565convex lens p. 5
Page 31 and 32: Record your answers on the answer s

Light Mirrors and Lenses (3379.0K) - McGraw-Hill Higher Education

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