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A student focussed the image of a candle...

A student focussed the image of a candle flame on a white screen using a convex lens. He notes down the position of the candle screen and the lens as under.
Position of candle=12.0 cm
Positio of convex lens=50.0 cm
Position of the screen=88.0 cm
what is the focal length of the convex lens?

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MODERN PUBLICATION-REFLECTION AND REFRACTION-EXAMPLE
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