. (a) A divergent lens has a focal length of 20 cm. At what distance should an object of
height 4 cm from the optical centre of the lens be placed so that the image is formed 10
cm away from the lens. Also find the size of image formed.
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here f is given 20 cm
O =4.0 [POSITIVE]
v=10cm [-ve]
1/v-1/u=1/f
= -1/u=1/v-1/f
-1/u=1/10-1/20
=2/20-1/20=1/20
so -1/u=1/20 and u=-20
I/O=v/u and so I=v/u*O=-10/-20*4
therefore I=2
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