Answer:
The focal length of the lens and the height of the image are -6.86 cm and -0.638 cm.
Step-by-step explanation:
Given that,
Distance of the object u = -16.0 cm
Distance of the image v = -12.0 cm
Height of the object = 8.50 mm = 0.85 cm
(a). We need to calculate the focal length
Using lens's formula

Where, f = focal length
u = distance of the object
v = distance of the image
Put the value into the formula




The lens is diverging.
(b). Using formula of magnification


Put the value in to the formula



The image is inverted.
Hence, The focal length of the lens and the height of the image are -6.86 cm and -0.638 cm.