
Diverging lens forms the image at its focus. The image formed by diverging lens is the object for converging lens.
∴ Distance of the object from converging lens is 40cm i.e., object is at double focal point.
∴ Image forms at double focal point on the other side of the lens.
v1−41=f1
v1−(−40)1=201
v1+401=201
v1=201−401=401
v=40