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

Uses for Convex MirrorsIf you were to compare a convex mirror with a plane mirror of the samesize, you would discover that more objects can be seen in the convexmirror. For this reason, convex mirrors are often used as securitymirrors in stores (Figure 11.19). A convex mirror allows you to view alarge region of the store from one location. For the same reason, convexmirrors are used in vehicles as side-view mirrors and rear-view mirrors.However, if you look in a convex mirror, it appears as if the image isoriginating from a smaller point behind the mirror. Because of thesesmaller images, convex mirrors on cars often have a warning such asthe one shown in Figure 11.20 that objects in the mirror are closer thanthey appear.You may have noticed convex mirrors used in some automatic tellermachines and computers (Figure 11.21). A convex mirror allows themachine users to see what is happening behind them while they arefacing the machine screen. Many camera phones include a convexmirror so that you can accurately aim the camera to take a self-portrait.Figure 11.19 A store security mirror Figure 11.20 A side-view mirror Figure 11.21 A security mirror on anautomatic teller machineLearning Checkpoint1. What is a real image?2. What is a virtual image?3. Name the features of the ray diagram identified as A, B, C, and D.DACBTake It FurtherThe first astronaut to walk on theMoon, Neil Armstrong, put aspecial mirror on the Moon’ssurface that was able to reflectlight directly back in the directionfrom which it came. Scientistsfrom Earth shine laser light at thismirror. Find out how this mirrorworks and what has been learnedfrom pointing a laser from Earth atthe mirror. Begin your research atScienceSource.4. Draw a ray diagram where the object is between one and two focal lengthsfrom a concave mirror with a focal length of 5 cm.5. Draw a ray diagram where the object is more than two focal lengths from aconcave mirror with a focal length of 5 cm.Ray diagrams model the behaviour of light in mirrors and lenses.427
D13 Quick LabPlane Mirror ReflectionThe reflective surface of the mirror may be at the backof the mirror or at the front of the mirror dependingwhere the reflective coating was applied to the glass orplastic you are using.PurposeTo investigate the law of reflection using a plane mirrorMaterials & Equipment• ruler• paper• protractor• plane mirrorProcedure• ray box or light sourcethat can be made intoa single 1-mm wideslit sourceCAUTION: Do not shine bright light into anyone’s eyes.Incandescent light sources can become very hot. Do nottouch the bulbs or block air flow around the light bulbs.1. Use the ruler to draw a straight vertical line in themiddle of a piece of paper. Use the protractor tocreate a perpendicular normal at the approximatecentre of the first line.2. Place the mirror upright along the vertical line.Hold the mirror in place. The normal should beperpendicular to the surface of the mirror.3. Shine a ray of light at an acute angle to the normalso that it reflects where the normal meets thereflecting surface. Use the ruler to trace theincident ray between the light source and themirror. Then, trace the reflected ray that reflectsfrom the mirror.4. Label the incident ray as i 1. Label the reflected rayas r 1(Figure 11.22).5. Repeat step 2 two more times with differentangles. Be sure to label the successive incidentand reflected rays as i 2, r 2and i 3, r 3.6. Measure and record the angle between each lightray and normal.Questions7. Compare the results of the angles of incidenceand reflection. Describe how they are related.8. (a) Are your results exactly the same as the law ofreflection? Explain.(b) What aspects of your experimental methodcould make your results different from the lawof reflection?90°reflecting surface(mirror)i 1incident rayθ i1θ r1Figure 11.22 A sample drawingnormalreflected rayr 1428 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 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 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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