A spherical mirror and a thin spherical lens have each a focal length of `- 15 cm`. The mirror and lens are likely to be

A spherical mirror and a thin spherical lens have each a focal length of -15cm. The mirror and the lens are likely to be

A spherical mirror and a thin spherical lens have each a focal length of - 15 cm. The mirror and the lens are likely to be

A spherical mirror and a thin spherical lens each have a focal length of - 15 cm . The mirror and lens are likely to be