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A parallel beam is incident on a convex ...

A parallel beam is incident on a convex lens of focal length `f`. It is then put in contact with a concave lens of focal length `f//2`, the image will be

A

Real, at `v=f//2`

B

Real, at `v=f`

C

Virtual, at `v=f//2`

D

Virtual, at `v=f`.

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