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

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 attempted is made to from an image on screen. If not position could be found. The focal length of the lens.

A

must be less than 40 cm

B

must be greater than 20 cm

C

must not be greater than 20 cm

D

must not be less than 10 cm

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