A9.0 cm object is 3.0 cm from a lens, which has a focal length of –12.0 cm.

The question is missing, but I guess the problem is asking for the distance and the size of the image.

Let's find the distance first, by using the lens equation:

where f is the focal length, the distance of the object from the lens, the distance of the image from the lens. Using and , we find


where the negative sign means the image is virtual, so located in front of the lens.

Now we can find the size of the image, using the relationship:

where and are the size of the image and of the object, respectively.
By using , we can find , the size of the image:

where the positive sign means the image is upright.

Sorry i don’t know what to do

Answermuch larger;