Question

a 5 cm tall object is placed perpendicular to principal axis of a convex lens of focal length 10 cm if the object is placed 30 cm away from lens find the position size and nature of image

Answer 1

focal length is + ve for convex lens so we can find image distance ... v = 15cm .. image is real or inverted

Answer 2

height of object=h0=5cm

focal length of lens=10cm

object distance=-30cm

1/f=1/v-1/u

=1/10-1/30

=3-1/30

2/30

v=30/2= 15cm

m=v/u

m=15/-30 =-1/2= -0.5cm

hi=m x ho

=-0.5x 5

= -2.5cm

object is placed beyond C and image formed is in between F and c.

Inverted, real and diminished.