Question

A divergent lens has a focal length of 20 cm .At what distance should an object of height 4 cm from the optical center of the lens be placed so that its image is formed 10cm away from the lens . find the size of the image also

Answer 1

1/v-1/u=1/f is a lens formula.
v=-10 (image distance)
f=-20 (focal length)
so by using lens formula,
1/u=1/v-1/f
=-1/10+1/20
=-1/20
1/u=-1/20
so u=-20 cm (object distance )
m=-h'/h
v/u=-h'/h
-10/-20=-h'/4
-h'=4×10/20
-h'=2
h'=-2 (size of image)

ANS:
object distance u=-20
size of the image h'=-2

Answer 2

I think its help you.!

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