Question

obtain the formula for magnification in term of magnificatiom (n) and object distance (u)​

Answer 1

Answer:

Explanation:

The plus/minus sign in the magnification just shows that whether image formed is real image or virtual image.

For real images, we have m = v/u

For virtual images , we have m = -v/u

That's why magnification is m = v/u = f/(u-f) for the real images formed by the spherical mirror

The minus sign in the magnification is showing whether image formed is inverted (positive for it) or erect (minus sign is considered) . Otherwise , magnification in terms of u and f is always f/(u-f)