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show ray diagrams of simple microscope, compound microscope and telescope.. calculate their equations to find out magnification...
Ray diagrams are used to show how a simple microscope forms an image.

SIMPLE MICROSCOPE
  





substituting ,we get 

                                                                                    

                                     


COMPOUND MICROSCOPE








          = mobjective x meyepiece

 eyepiece is a simple microscope,its magnification power is

               Me  = ( 1 + D/ fe ) 

           Mo = ( (v / fo) -1)

             M = Mo * Me




TELESCOPE

Angle seen at objective = ?0
Angle seen at eyepiece = ?e
Focal length of objective = f0
Focal length of eyepiece = fe
Then the telescope's magnification will be






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