Question
In Example 9.4 (convex lens, f = +10 cm, object 2.0 cm tall at u = -15 cm, v = +30 cm), the image height h' is calculated to be -4.0 cm. What does this tell us about the image?
It is virtual, erect, and smaller than the object
It is real, inverted, and enlarged (twice the object's height)
It does not form at all
It is exactly the same size as the object
Detailed Explanation
Since h' is negative and larger in magnitude than h, the image is real, inverted, and enlarged -- specifically twice the size of the object (magnification -2), as concluded in Example 9.4.