Question

Design a microscope with a 20X objective, 160 mm tube length and an eyepiece that produces another 1.5X of visual magnification. For simplicity, you may put the image for the eye at infinity. Begin your design with a drawing of the situation. Then graphically trace your rays through the system. You should be able to answer the following questions when your design is complete: What is the focal length of the objective lens in mm? For the previous question's microscope design, what is the focal length of the eyepiece in mm? For the previous question's microscope design, what is the magnitude of the object distance.

Answer 1

Since final image is formed at infinity hence formula for magnification (m) becomes as under

m=m_{​​​​​​o}.m_e= (v_{​​​​​​o}​/u_​​​o)(D/f_{​​​​​​e})