A microscope has an objective lens with a focal length of 16.22 mm and an eyepiece with a focal length of 9.20 mm. by the length of the barrel set at29.0 cm, the diameter of a red blood cells image subtends an angle of 1.43 m rad with the eye. If the final image distance is 29.0 cm from the eyepiece, what is the real diameter of the red blood cell?