Question: 3 4 . 9 1 - An object to the left of a lens is imaged by the lens on a screen 3 0 .

34.91- An object to the left of a lens is imaged by the lens on a screen 30.0 cm to the right of the lens. When the lens is moved 4.00 cm to the right, the screen must be moved 4.00 cm to the left to refocus the image. Determine the focal length of the lens.
The answer is 10.6cm but i dont know how to get this.
3 4 . 9 1 - An object to the left of a lens is

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