A concave lens of focal length f forms an image which is n times the size of the object. What are the distance of the object from the lens in terms of f and n?

A concave lens of focal length f forms an image which is n times the s

1.	A concave lens of focal length f forms an image which is n times the size of the object. What are the distance of the object from the lens in terms of f and n?
Answer» SOLUTION :The concave LENS formula is `1/v-1/u=1/f` where no sign conventions are to be USED. Then , `u/v-1=u/f or 1/n-1=u/f (because v/u=n)` or `u=((1-n)/n)f`