Question

explain the working of a compound microscope by focal length of a convex lens

Answer 1

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Working of compound microscope

       The ray diagram to show the working of compound microscope is shown in figure. A tiny object AB to be magnified is placed in front of the objective lens just beyond its principal focus fo’. In this case, the objective lens O of the compound microscope forms a real, inverted and enlarged image A’B’ of the object.

       Now A’B’ acts as an object for the eye piece E, whose position is adjusted so that A’B’ lies between optical centre C2 and the focus fe’ of eye piece. Now the eye piece forms a final virtual, inverted and highly magnified image A”B”. this final image A”B” is seen by our eye hold close to eye piece, after adjusting the final image A”B” at the least distance of distinct vision of 25 cm from the eye.

                          Ray diagram of compound microscope 

Magnification of compound microscope

       The magnification of compound microscope is given by:

            m    =     

    where,   D = Least distance of distinct vision (25 cm)
                 L = Length of the microscope tube
                fo = Focal length of the objective lens
                fe = Focal length of the eye-piece lens 


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Answer 2

Answer:

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