Question

4 cm height object is placed at 2F of a convex lens then find the magnification of image

Answer 1

m= -v/u. u always be negative

1/f= 1/u+1/v

1/2f = - 1/4+1/v

from this equation v= 2cm

m= - v/u

4/ -2

=. -2 cm

in the question the ask height so then

magnification also equal to height

therfore answer is +2cm