A diverging lens is utilized to form a virtual image of an object. The object is 55 cm in front of the lens and the image is 27.5 cm in front of the lens. Decide the focal length of the lens.
The distance from the front to the back of your eye is approximately 1.89 cm. If you can see a clear image of a book when it is 35.8 cm from your eye, what is the focal length of the lens/cornea system?