This part of the investigation requires a field trip to several department stores for on-site measurements. The measurements that the students obtain may be somewhat imprecise because of the crude equipment that is recommended. A builder’s contour tool is suggested to contour the shape of the angles between the mirrors. The shape can then be traced on a sheet of paper and measured with a protractor. Students should be required to obtain the following for each of the mirrors observed.
1. approximate measures of the angles
2. a description of how well the particular angle setting enables views of the front, sides and back
When the students return to their classroom, they should compare findings with their previous assumptions and use of this information to come up with a recommendation for the optimal angle settings.