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0. A screen is placed at a distance 40 cm away from an illuminated object. A converging lens if placed between the source and screen and attempt is made to form an image on screen. If no position could be found. The focal length of the lens (NTSE Bihar, Stage-I, 2014-15)
Must be less than 10 cm
Must be greater than 20 cm
Must not be greater than 20 cm
Must not be less than 10 cm
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