1016_Physics ProblemsTechnical Physics

# 1016_Physics ProblemsTechnical Physics - Chapter 36 P36.18...

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Chapter 36 357 P36.18 Assume that the object distance is the same in both cases (i.e., her face is the same distance from the hubcap regardless of which way it is turned). Also realize that the near image ( q =− 10 0 . cm ) occurs when using the convex side of the hubcap. Applying the mirror equation to both cases gives: (concave side: RR = , q 30 0 cm ) 11 30 0 2 pR −= . or 2 30 0 30 0 R p p = . . cm cm af (1) (convex side: , q 10 0 10 0 2 . or 2 10 0 10 0 R p p = . . cm cm . (2) (a) Equating Equations (1) and (2) gives: 30 0 300 10 0 . . . cm cm p p or p = 15 0 cm . Thus, her face is 15 0 cm from the hubcap. (b) Using the above result ( p = 15 0 cm ) in Equation (1) gives: 23 0 0 1 5 0 15 0 R = .. . cm cm 30.0 cm cm or 21 30 0 R = cm and R = 60 0 . The radius of the hubcap is
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