How Do Rearview Mirrors Affect Image Size?

[jena]

Hi,

Question

Some rearvier mirrors produce images of cars behind you that are smaller than they would be if the mirror were flat. Are the mirrors concave or convex? What is the mirror's radius of curvature if cars 20.0 m away appear 0.33x their normal size.

My Answers

The mirrors are concave.

f=r/2

f=(20*.33)/2
f=3.3 m

Is this correct?

Thank you

 

[Chi Meson]

the mirrors are NOT concave. What's your next guess?

ANd no, your math is not correct.
Use the magnification equation to find the image distance.
Use the "thin lens" equation (it's the same for mirrors) to find the focal length.
then proceed.