This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
The resolving power of a microscope depends upon all of the following except: 
Select and explain. 
A. Size of the apeure, B. Focal length of the eyepiece, C. Thickness of the film, D. Wavelength of light source used
C: Thickness of the film
Answer: C: Thickness of the film 
Explanation: Ans: C. Thickness of the film(Ref Bancroft Theory & Practice of Histochemical Techniques/p45-47).Resolving power of microscope:Microscope specific.Inversely distance between two objects that can be resolved.Doesn't depend on specimen nature or thickness.According to Abbe's Criterion.