The image formed by a convex mirror is of size one-third the size of object. How are u and v related?
Magnification (m) = - image distance (v)object distance (u)\dfrac{\text {image distance (v)}}{\text{object distance (u)}}object distance (u)image distance (v) = - 13\dfrac{1}{3}31
Hence, we get,
v = - 13\dfrac{1}{3}31u
Or
u = -3v
