calculate the focal length and nature of the lens.

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A candle is placed 15 cm in front of a lens. If the image of the candle captured on a screen is magnified two times, calculate the focal length and nature of the lens.
07
Oct
A candle is placed 15 cm in front of a lens. If the image of the candle captured on a screen is magnified two times, calculate the focal length and nature of the lens. A candle is placed 15 cm in front of a lens. If the image of the candle captured on a screen [...]
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