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A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________?
Physicsmedium
Af2 + f1
Bf2 – f1
Cf1f2/f2+f1
f1f2/f1-f2
Correct Answer: D. f1f2/f1-f2
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