You have a lens whose focal length is -6.81 cm. You place an object on the axis of the lens at a distance of 11.7 cm from it. How far is the object's image from the lens? Enter the answer as a positive quantity. image distance: cm If it can be determined, is the image real or virtual? real O virtual O cannot be determined If it can be determined, is the image upright or inverted with respect to the object? O upright O cannot be determined inverted