# Convex mirror problem help?

Convex mirror problem help??

## Homework Statement

a convex mirror has a focal length of 75cm. an object with a height of 2.0m is 6.0m from the mirror.
a) what is the distance from the object's virtual image to the mirror?
b) what is the height of the object's image?

## Homework Equations

1/f = 1/do + 1/di

## The Attempt at a Solution

1/0.75m = 1/6.0m + 1/di
di = 0.857m

but the answer should be -0.67 for a and i dont know part b

rl.bhat
Homework Helper

Use proper sign convension. Focal length of the convex mirror to be taken as negative.
For second part, use magnification formula. m = di/do

thanks! ^^