A real object is 42.1 cm from a lens that has a negative focal length of 25.6 cm. The object is 2.45 mm high. The height and orientation of the image are

Question

Quizplus · Accepted Answer

The lens formula is 1/f = 1/v - 1/u, where f is the focal length, v is the image distance, and u is the object distance. For a lens with a negative focal length, the image is virtual and erect. Using the magnification formula, m = -v/u = h'/h, where h' is the image height and h is the object height, we find the image height to be 0.93 mm and erect.

A Real Object Is 42