Question

A divergence lens of focal length of 30cm forms the image of an object of size 6 cm on the same side as of the object at a distance of 15cm from its optical centre .use lens formula to determine the distance of the object from the lens and the size of image formed ...

Draw a ray daigram to show the formation of image in the above situation .

Answer 1

1/f=1/v-1/u
1/u=1/v-1/f
=1/-15 - 1/-30
=1/-15 + 1/30
=-2+1/30
=-1/30
u=-30cm

Now,
h'/h=v/u
h'=-15*6/-30
=3cm