Posted by **Rebecca** on Sunday, December 1, 2013 at 8:15pm.

A child holds a candy bar 13.4 cm in front of the convex side-view mirror of an automobile.

The image height is reduced by one fifth.

What is the radius of curvature of the mirror?

Answer in units of cm.

I did 1/5=-image distance (i)/13.4-->i=-2.68

1/f=1/-2.68+1/13.4---->-3.35

|f|*2=r

r=6.7cm

but this was not the right answer. Where did I go wrong/ how do you solve?

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