How can image size and image distance be related in convex mirrors?

[noname1]

I know that on concave mirrors to find the object distance we can use

di/image size * f

but now i am confused i am trying the same for convex mirror but it is not working for me, should the formula work also for it?

 

[Paulie323]

No the formula is different try maybe this equation 1/f=(1/do)+(1/di)
hope this helped! :)

 

[noname1]

No the formula is different try maybe this equation 1/f=(1/do)+(1/di)
hope this helped! :)

yes i am aware of that formula but i needed to relate image size and image distance while that formula relates image distance and object distance but thanks for trying to help out