Question

Calculate the magnification of the image formed when object is kept in front of a convex lens of focal length 40 cm at a distance of 160 cm.

Answer 1

Answer:

f=+40cm

u=-160cm

1/v+1/u=1/f

1/v=1/f-1/u

1/40+1/160

4+1/160

5/160

v=160/5=32cm

m=v/u

=32/-160

=-1/5 =0.2cm

the image is demagnified

real and inverted