Answer:
The magnification of the lens is 0.7
Step-by-step explanation:
We have,
Height of an object is 5 cm
Object is placed 4.25 cm from a lens
Image is formed 3.00 cm behind the lens.
It means u = -4.25 cm
v = -3 cm (behind the lens)
Magnification of the lens is given by :

So, the magnification of the lens is 0.7