An object is placed 230 cm to the left of a positive lens of focal length 50.0 cm. A "mystery" lens is placed 131 cm to the left of original lens (so that it is located between the original lens and the object). The nal image of this two-lens system appears on a screen located 300.0 cm behind (to the right) of the original lens. Calculate the focal length of the \"mystery" lens. Image size: 3 M L Max 'M'GWWW'OID'I