An Object and a Screen Are Separated by 26

Multiple Choice

An object and a screen are separated by 26.0 cm.A convex lens is placed between them,9.00 cm from the object.In this position it causes a sharp image of the object to form on the screen.What is the focal length of the lens?

A) 6.69 cm
B) 19.1 cm
C) 5.88 cm
D) 13.8 cm
E) ​8.50 cm