An object `1cm` tall is placed `4cm` in front of a mirror. In order to produce an upright image of `3cm` height one needs a

Options

A. Convex mirror or radius of curvature `12cm`
B. Concave mirror of radius of curvature `12cm`
C. Concave mirror of radius of curvature `4 cm`
D. Plane mirror of height `12 cm`

Answer

B

Explanation

Erect and enlarged image can produced by concave mirrorr.
`(I)/(O)=(f)/(f-u)implies(+3)/(+1)=(f)/(f-(-4))impliesf=-6cm`
`impliesR=2f=-12cm`