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A thin cylindrical rod of length 10cm is...

A thin cylindrical rod of length `10cm` is placed horizontally on the principle axis of a concave mirror of focal length `20cm`.The rod is placed in a such a way that midpoint of the rod is at `40cm` from the pole of mirror.The length of the image formed by the mirror will be `x/3`cm.The value of `x` is

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