Which expression correctly represents the magnification produced by a spherical mirror

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

Which expression correctly represents the magnification

m

produced by a spherical mirror, in terms of image height

h_i

, object height

h_o

, image distance

v

and object distance

u

(all distances measured from the pole using the Cartesian sign convention)? (a)

m=\dfrac{h_i}{h_o}=\dfrac{v}{u}

(b)

m=\dfrac{h_i}{h_o}=-\dfrac{v}{u}

(c)

m=\dfrac{h_o}{h_i}=-\dfrac{v}{u}

(d)

m=\dfrac{h_i}{h_o}=-\dfrac{u}{v}