A lens is placed between a candle and a fixed screen forms a real t...

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A lens is placed between a candle and a fixed screen forms a real triply magnified image of the candle
\( \mathrm{P} \) on the screen. When the lens is moved away from

W the candle by \( 0.8 \mathrm{~m} \) without changing the position of the candle, a real image one-third the size of the candle is formed on the screen. The focal length of the lens (in \( \mathrm{m} \) ) is
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