An object is at a distance of 10 cm from a mirror and the image of the object is at a distance of 30 cm from the mirror on the same side as the object. Then the nature of the mirror and focal length is.
Convex, 15 cm
Concave, -15 cm
Concave, -7.5 cm
Convex, 7.5 cm
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option b is the answer
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