Question

The linear magnification for the mirror is 'm'. If f is the focal length of the mirror, v is the image distance and 'u' is the object distance, the linear magnification is equal to a.(f -u)/f b. f/(f+v) c. (f+c)/f d. f/(f-u)

Answer 1

m=-v/u

1/f=1/v+1/u

->u/f=u/v+1

u/f -1=u/v

u-f/f=u/v

f-u/f = -u/v

-v/u= m = f-u/f