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A concave mirror of focal length f1 is placed at a distance of d from covex lens of focal length f2. A beam of light coming from infinity and falling on this convex lens-concave mirror combination returns to infinity. The distance must equal to- 1) 2f1 + f2 2) -2f1 +f2 3)f1+ f2 4) -f1 + f2

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