Part A The medium-power objective lens in a laboratory microscope has a focal length fobjective = 3.75 mm. If this lens produces a lateral magnification of -43.0, what is its 'working distance'; that is, what is the distance from the object to the objective lens? Express your answer using three significant figures.
Part B What is the focal length of an eyepiece lens that will provide an overall magnification of -115? Assume student's near-point distance is N = 25 cm. Express your answer using two significant figures.