An object is placed at a distance of $15 c m$ from a convex lens of focal length $10 c m$ . On the other side of the lens, a convex mirror is placed at its focus such that the image formed by the combination coincides with the object itself. The focal length of the convex mirror is

20 c m

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10 c m

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15 c m

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30 c m

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Solution

The correct option is B $10 c m$

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