Question

An object `1cm` tall is placed `4cm` in front of a mirrorr. In order to produce an upright image of `3cm` height one needs a
A. Convex mirrorr or radius of curvature `12cm`
B. Concave mirrorr of radius of curvature `12cm`
C. Concave mirrorr of radius of curvature `4 cm`
D. Plane mirrorr of height `12 cm`

Answer 1

Correct Answer - B
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`