上海交通大学：《Structural and Chemical Characterization of Materi》教学资源_HW

Homework assignment(released on March 5,due on March 12,2019) (Use an A4 sheet) 1.Estimate the resolution limit of an optical microscope based on the following equation: Ro 0.612λ △ro M nsina 2.Take pictures using your cellphone and try to find the aberrations of the optical system.Briefly describe your procedure and the result. 3.If we have objective lens A (50x,NA=0.65)and objective lens B(50x,NA=0.95) Which one will have a better resolution?Which one would you choose to observe a specimen with rough surface? 4.Explain the advantage of using Dark Field image mode over Bright Field image mode. 5.For a Mg sample,would you use cold mounting or hot mounting?Search the literature and find an electrolytic polishing procedure(solution,voltage,current density,time)to prepare Mg samples

Homework assignment (released on March 5, due on March 12, 2019) （Use an A4 sheet） 1. Estimate the resolution limit of an optical microscope based on the following equation: 2. Take pictures using your cellphone and try to find the aberrations of the optical system. Briefly describe your procedure and the result. 3. If we have objective lens A (50, NA=0.65) and objective lens B (50, NA=0.95). Which one will have a better resolution? Which one would you choose to observe a specimen with rough surface? 4. Explain the advantage of using Dark Field image mode over Bright Field image mode. 5. For a Mg sample, would you use cold mounting or hot mounting? Search the literature and find an electrolytic polishing procedure (solution, voltage, current density, time) to prepare Mg samples