Question

An object is kept at a distance of 40 cm
from a convex lens. If the focal length of
the convex lens is 25 cm, what will be the
magnification?​

Answer 1

u= -40cm

f= 25 cm

1/f= 1/v-1/u

1/v= 1/f=1/u

1/v= 1/25+1/-40

1/v= -15/-1000

v= 1000/15cm

m= v/u

  = (1000/15)1/-40

  = 25/-15

  = -5/3

  m= -1.67