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A concave mirror of focal length f1 is placed at a distance of d from a convex 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 d must be equal

  • f1 +f2

  • -f1 +f2

  • 2f1+f2

  • -2f1 +f2

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