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Convex Mirror / Virtual Image

  • Thread starter matt72lsu
  • Start date
  • #1
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Homework Statement


The virtual image produced by a convex mirror is one-quarter the size of the object.
b) What is the focal length of this mirror?

Homework Equations



1/di = 1/f - 1/do

The Attempt at a Solution


i found di to be -9.3 cm but when i solved for f i keep getting it wrong. Help!! (and -9.3 is correct so thats not the problem)
 

Answers and Replies

  • #2
ideasrule
Homework Helper
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Can you show your calculations?
 
  • #3
94
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i did 1/-9.3 = 1/f - 1/37 (do) then solved for f
 

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