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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)