A point object is placed at a distance of 60 cm from a convex lens of focal length 30 cm. If a plane mirror were put perpendicular to the principal axis of the lens and at a distance of 40 cm from it, the final image would be formed at a distance of

1. A. 30 cm from the lens, it would be a real image
2. B. 30 cm from the plane mirror, it would be a virtual image
3. C. 20 cm from the plane mirror, it would be a virtual image
4. D. 20 cm from the lens, it would be a real image

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