Final answer:
The image distance for a diverging lens can be found using the lens formula, with a negative focal length for diverging lenses.
Step-by-step explanation:
The student has asked about the image distance (−) for a diverging lens with a given focal length and object distance.
To find the image distance for a diverging lens, we can use the lens formula, which is given by −1/f = −1/do + −1/di, where f is the focal length, do is the object distance, and di is the image distance.
For a diverging lens, the focal length is negative, so we have f = −9.00 cm, and the given object distance is do = 18.0 cm.
Plugging these values into the lens formula, we get:
1/−9.00 cm = 1/18.0 cm + 1/di
When solving for di, we get the image distance on the same side of the lens as the object, which is a characteristic of a diverging lens. This means that the image formed is virtual and upright.
In conclusion, the procedure involves using the lens equation to solve for the image distance, taking care to insert the negative focal length value for a diverging lens.