An object $(h_0=4\mathrm{.}0cm)$ is placed a distance of $16\mathrm{.}2$ cm in front of a converging lens, the image is observed $29\mathrm{.}0$ cm behind the lens. What is the focal length of the lens?

$9\mathrm{.}6$ cm

$36\mathrm{.}7$ cm

$10\mathrm{.}4$ cm

$-36\mathrm{.}7$ cm

Question $4$

$2$ pts

In question $3,$ what is the height of the observed image?

$-2\mathrm{.}2cm$

$-1\mathrm{.}79cm$

$+1\mathrm{.}79cm$

$-7\mathrm{.}2cm$