A point object O is kept at a distance of 30cm
from a convex lens of power +4D towards its
left. It is observed that when a convex mirror is
kept on the right side at a distance of 50cm from
the convex lens, the image of the object O
formed by the lens - mirror combination
conicides with the object itself. Calculate the
focal length of the convex mirror.
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the focal length of the convex mirror is 25cm
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