Cynthia is taking pictures with a smartphone with dimensions 16cm by 8cm by 1cm. She notices that it is unable to take good images of objects closer than 10cm. (Like larger cameras, you should know that the lens of a smartphone camera moves very slightly as it focuses. Assume the furthest the lens can be from the detector is the thickness of the phone.) A) Calculate the optical power of the camera lens. B) Draw a scaled ray-tracing image of the phone taking a picture of a flower at the closest possible location (10cm).