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_____________?
(A) f2 + f1
(B) f2 – f1
(C) f1f2/f2+f1
(D) f1f2/f1-f2
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_____________?
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