A converging beam of rays is incident on...

A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15 cm from the lens on the opposite side. If has lens is removed the point where the rays meet will move 5 cm closer to the lens. The focal length of the lens is

`-30 cm`

5 cm

`-10 cm`

20 cm

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