In order to measure focal length of a diverging lens (L2), we set up the following experiment (as shown in the right figure). It uses another converging lens (L). An object (o) is placed in front of lens (L,). The image of the object can be seen on a screen (S,), which is located 20cm behind lens (L2). Next, after removing lens (L2) only, the image can be restored (seen) by moving screen 5cm toward lens (L,) to a new location of S-. Please compute the focal length of lens (L2). Scm 20cm
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