Chapter 11.pdf

D26 Inquiry ActivityIdentifying the Properties of ImagesSkills References 2, 8SKILLS YOU WILL USE■ Interpreting data/information toidentify patterns or relationships■ Identifying sources of errorQuestionHow can you use ray diagrams to determine theproperties of images formed by convex lenses?Materials & Equipment• 3 sheets of legal paper• sharp pencilProcedure• ruler• calculator1. Make an observation table with the rows andcolumns shown at the bottom of this page. Namethe table “Convex Lens Focal Length 4.0 cm.”2. Turn a piece of legal paper sideways. Use theruler to draw a horizontal line across the middle ofthe paper. This is the principal axis of the lens.3. At the midpoint of the principal axis, draw aperpendicular vertical line that is 5.0 cm aboveand below. This is the axis of symmetry of thelens. Label the axis “Convex Lens.”4. Measure 4.0 cm to the left of the vertex along theprincipal axis, and place a dot. This is thesecondary focus, F’, of the lens. Do the samething on the other side of the lens for the primaryfocus, F. Label both focuses.5. Place two more dots at twice the focal length, andlabel them 2f’ and 2f accordingly.6. Repeat steps 2 to 5 twice to create a total of threeconvex lens diagrams.7. Using one of the convex lens diagrams, draw avertical arrow at d oas indicated in the “ConvexLens” table to the height h o.8. Complete the ray diagram to produce the image ofthe arrow at the appropriate place on the diagram.Label the object and the image.9. Measure and record d iand h i. Then, finish thenext two ray diagrams for convex lenses using thevalues in the next two rows of the table.Analyzing and Interpreting10. Write a general statement that relates the size,orientation, and type of image to the object for aconvex lens when:(a) d ois greater than 2f(b) d ois between 2f and f(c) d ois less than fSkill Practice11. Use the data you collected to interpolate wherethe object would have to be placed so that themagnification of a convex lens would be exactly 1.12. Calculate d iand h iusing the thin lens andmagnification equations for each set of data in thetable. Compare these values to the ones youobtained using ray diagrams. Do they agree? Ifnot, suggest reasons why the values are different.Forming Conclusions13. Describe how you can use ray diagrams todetermine the properties of images formed byconvex lenses.Object Data Image Characteristics Image Data Calculated o(cm) h o(cm) Side ofLens10.0 2.06.0 2.02.0 2.0Real orVirtualSizeUpright orInvertedd i(cm) h i(cm) d ih iRay diagrams model the behaviour of light in mirrors and lenses.461