A microscope has an eyepiece that gives an angular magnification of 5.00 for a final image at

Question:

A microscope has an eyepiece that gives an angular magnification of 5.00 for a final image at infinity and an objective lens of focal length 15.0 mm. The tube length of the microscope is 16.0 cm.
(a) What is the transverse magnification due to the objective lens alone?
(b) What is the angular magnification due to the microscope?
(c) How far from the objective should the object be placed?