A $4\mathrm{.}01$ mm high diamond is placed on the axis of$,$ and

$10\mathrm{.}9$ cm from, a lens with a focal length of $-5\mathrm{.}21$ cm $.$

If it can be determined, is the diamond's image real or virtual?

virtual

real

cannot be determined

How high $h_i$ is the image?

Express the answer as a positive quantity.

$h_i=$

If it can be determined, is the image upright or