A screen is placed a distance 40 cm away...

A screen is placed a distance 40 cm away from an illuminated object. A converging lens is palced between the source and the screen and it is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens

must be less than 10 cm

must be greater than 10 cm

must not be greater than 20 cm

must not be less than 10 cm

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