Answer:
The focal length of the lens is -6.85 cm.
The lens is diverging lens.
The height of the image is 6.4 mm.
Explanation:
Given that,
Object distance = 16.0 cm
Image distance = 12.0 cm
Height of object = 8.50 mm
We need to calculate the focal length of the lens
Using formula of lens

Where, v = image distance
u = object distance
Put the value into the formula


Focal length is negative so the lens will be diverging lens.
We need to calculate the height of the image
Using formula of magnification

Put the value into the formula




Hence, The focal length of the lens is -6.85 cm.
The lens is diverging lens.
The height of the image is 6.4 mm and straight.