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16.A concave mirror of focal length 'f, is placed at adistance of 'd' from a convex lens of focal length'f'. A beam of light coming from infinity and fallingon this convex lens-concave mirror combinationreturns to infinity. The distance 'd' must equal :(2) -24, +40 dit(1) 2f1 + f2(3) f1 + f2(4) -fi +12

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1) is the correct answer

(1) 2f1+f2 is the answer



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