Chapter 11.pdf

18. A student looks at the letters on a pagethrough a convex lens. The student holds thelens so the image of the letters appears to be12 cm from the lens. The focal length of thelens is 24 cm.(a) How far away from the page is thestudent holding the lens? a(b) What is the magnification of the lens? a19. An object placed near a convex lens ismagnified 14 times. The image formed is6.0 cm high. What is the height of the object?20. A layer of oil floats on top of water. A ray oflight in the oil approaches the surface of thewater at an angle of 40°. It is refracted at anangle of 35.6°. What is the refractive index ofthe oil? a21. A ray of light approaches the flat surface of adiamond at normal incidence 0.0°. What isthe angle of refraction? a22. A camper viewing the reflection of the fullMoon in a smooth lake notices that the imageis almost perfectly circular. What wouldhappen to the image of the Moon if the waterbecame rough? t23. You look at an image in a reflecting surface.How can you tell if the image is real orvirtual? aa28. (a) Suppose you were camping and forgot tobring matches for your campfire. Explainhow you could start a fire with aconverging piece of glass. a(b) Would a diverging piece of glass workequally well for this job? Explain why itwould or would not. tReflection29. What can you explain about light and the wayit interacts with matter that you were not ableto before this chapter? c30. What are three concepts from this chapterthat you are interested in learning more aboutin this class or in the future? cAfter ReadingReflect and EvaluateInterview a partner about the challenges of readinggraphics. Why can graphics be difficult to read andunderstand? How can graphics support you inunderstanding concepts and ideas? Together, create aposter on the computer using a diagram or flowchartto alert readers to strategies for reading graphics.24. Explain the conditions required for totalinternal reflection. a25. A compound microscope uses a convexobjective lens that magnifies the object 40.0times. If the object is 0.20 mm high, how highis the image? a26. Lenses and mirrors both create images byredirecting light. Make a chart to compare thedifferences and similarities in how lenses andmirrors create images. t27. You have been given several pieces of clear,hard, rock-like material from a fraudinvestigation. The subject of the investigationis accused of trying to substitute cubiczirconia for diamond. Explain the steps youwould follow to identify the material. tUnit Task LinkYour Unit Task is to design and build a shade for astreetlight that reduces light pollution in the nightsky. What kind of mirror or lens will you use to makemost of the light shine downward? How will thedesign of your shade prevent light from shiningupward? Sketch some possible designs you coulduse for your shade.Ray diagrams model the behaviour of light in mirrors and lenses.465