Question

what is the image distance and image size if a 3.00 cm tall light bulb is paced at a distance of 30.5 cm from diverging lens having a focal length of -10.2 cm?

Answer 1

$$\dfrac 1f=\dfrac 1o+\dfrac 1i,\\\space\\ i=-7.64\text{ cm}.\\\space\\ h_i=-\dfrac ioh_o=0.75\text{ cm}.$$