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[" A point object "0" is kept at a dista...

[" A point object "0" is kept at a distance of "],[30cm" from a convex lens of focal lens "],[25cm" 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 "0" formed by the lens-mirror "],[" combination coincides with the object "],[" itself.Calculate the focal length of the "],[" convex mirror."]

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