Shiny lawn spheres placed on pedestals are convex mirrors. One such sphere has a diameter of 54.0 cm. A 12 cm robin sits in a tree 1.8 m from the sphere. Where is the image of the robin?

cm (from the mirror)

How long is the image?

cm

I believe this uses the formula M=hi/ho=-di/do. But, I am unsure how to approach this correctly. I keep getting 540/37 which is wrong for the first part and thus am unable to approach the second phase.

cm (from the mirror)

How long is the image?

cm

I believe this uses the formula M=hi/ho=-di/do. But, I am unsure how to approach this correctly. I keep getting 540/37 which is wrong for the first part and thus am unable to approach the second phase.