A convex mirror forms an image one-fourth the size of the object. If object is at a distance of 0.5 m from the mirror the focal

A convex mirror forms an image one-fourth the size of the object. If object is at a distance of 0.5 m from the mirror the focal length of the mirror is
A. 0.16
B. `-1.5 m`
C. 0.4 m
D. `-0.4 m`

A convex mirror forms an image one-fourth the size of the object. If object is at a distance of 0.5 m from the mirror the focal length of the mirror i

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