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Mirror Formula and Magnification

In an experim...

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In an experiment for determination of focal length of the convex mirror, a convex lens of focal length 20 cm is placed on the optical bench and an object is placed at a distance of 30 cm from the lens, when convex mirror is introduced in between the lens and the real inverted image of the object the final image of object O is formed at O itself if the distance between lens and the mirror is 10 centimetre then focal length of the mirror is a. 10 centimetre b. 20 centimetre c. 25 centímetre d. 50 centimetre

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