Question

A 5 cm tall object is placed perpendicular to the principle axis of a convex lens of focal length 12 cm. The distance of the object from the lens is 8 cm. Using the lens formula, find the position, size and nature of the image formed. h=5cm f=

Answer 1

this will help you in solving your problem

Answer 2

Given :

height of object=h0=5cm

focal length of lens=10cm

object distance=-30cm after sign conventions.

image distance=?

By lens formula :

1/f=1/v-1/u

1/v=1/f+1/u

=1/10-1/30

=3-1/30

2/30

v=30/2= 15cm

magnification=m=v/u

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

m=hi/ho

hi=mxho

=-0.5x 5

= -2.5cms

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

Inverted, real and diminished.