Readings of to find the focal length of a convex mirror using a convex lens of focal length 20cm

Hi Gohiya,
An optical bench with four uprights (two fixed uprights in middle, two outer uprights with lateral movement), convex lens (20 cm focal length), convex mirror, a lens holder, a mirror holder, two optical needles, (one thin, one thick) a knitting needle, and a half metre scale
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