Homework Help: physics!!!!!

Posted by please help me out!!! please on Monday, February 11, 2013 at 11:34am.

When the distance between the hole and floor is h1=20 cm, the images's length is l1=20 cm; when the distance between the hole and floor is h2=40 cm, the images's length is l2=36 cm . What is the length L of the ceiling lamp in m?

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