Physics

Problem

A concave spherical mirror has a focal length of

12\,\text{cm}

. An object is placed

18\,\text{cm}

in front of the mirror on the principal axis. What is the image distance

s_i

? a)

s_i = -6.0\,\text{cm}

s_i = +36\,\text{cm}

s_i = -36\,\text{cm}

s_i = +7.2\,\text{cm}