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:
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Position of the image formed by lens.
v=60cm
So, position of the image is (60 - 40) = 20 cm behind the plane mirror, it acts as a virtual object So final image is a real image 20 cm from the plane mirror.
This real image will act as an object for the lens and final image is
v = -60cm from lens
i.e., 20 cm behind the plane mirror.
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