Final answer:
The focal length of a -3.25 diopter lens is -0.3077 meters, indicating that it is a diverging lens which forms virtual images. This can also be expressed as -3.077 dm, -30.77 cm, or -307.7 mm.
Step-by-step explanation:
The focal length of a -3.25 diopter lens can be found by using the formula Power (P) = 1/focal length (f), where the focal length is in meters. Since we know the power of the lens is -3.25 D, we can rearrange the formula to solve for focal length: f = 1/P.
So, the focal length f = 1/(-3.25) = -0.3077 meters. Since a negative focal length indicates a diverging lens, which forms virtual images, the focal length of the lens is not just -0.3077 meters, but also creates virtual images.
To convert this focal length to other units:
A. In meters: -0.3077 m
B. In decimeters: -3.077 dm
C. In centimeters: -30.77 cm
D. In millimeters: -307.7 mm