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A convex lens of focal length $20 c m$ and another plano convex lens of focal length $40 c m$ are placed co-axially. The plano convex lens is silvered on plano surface. What should be the distance between the two lenses so that final image of object $O$ at $10 c m$ in front of convex lens is formed on $O$ itself $μ$ of glass is $3 / 2$
$10 c m$
$20 c m$
$30 c m$
$40 c m$

A

40 c m

B

10 c m

C

20 c m

D

30 c m

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