Question

A divergent lens of focal length 30 cm forms the image of an object of size 6cm on the same side as the object at a distance of 15cm from its optical centre. Draw a ray diagram to show the formation of image on the above situation.

Answer 1

F=-30cm h=6cm v=-15cm

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

Hope it helps you dear......

Answer 2

F=-30cm h=6cm v=-15cm

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

Hope it helps you dear......

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