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An object is placed at a distance 2f fro...

An object is placed at a distance `2f` from a concave mirrorr of focal length `f`. Light reflected from the mirrorr falls on a plane mirrorr. The distance of the plane mirrorr from the concave mirrorr equals `f`. The distance of the final image (due to reflection at both concave and plane mirror) from the concave mirrorr is

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