Assume that an oil objective has numerical aperture na = 1.4. Assuming that its object focal length is 2 mm. Use the definition of the numerical aperture to determine the diameter of the aperture...

Assume that an oil objective has numerical aperture na = 1.4. Assuming that its object focal length is 2 mm. Use the definition of the numerical aperture to determine the diameter of the aperture associated with this objective. Now assume that the tube lens in the same microscopy system has an image focal length of 200 mm. Determine the numerical aperture of the tube lens assuming that it shares the same aperture with the objective.