Optical Instruments349The image distance for the objective lens is then and the object distance for this lens is 129.0 cm0.920 cm28.1 cmeqLp=− =−=()( )11128.1 cm1.622 cm1.72 c28.1 cm1.622 cmooqfp===−−m The magnification by the objective lens is given by 11128.1 cm16.31.72 cmqMp=−and the overall lateral magnification is ( )( )1MM16.331.5514−+=−eMThe lateral size of the final image is ( )3210cm×29.0 cm1.4310rad4eehqθ′=⋅=×=.15and the size of the red blood cell serving as the original object is 4714.1510m8.0610m0.806514ehhM−−′×=×=mµ25.25Some of the approximations made in the textbook while deriving the overall magnification of a compound microscope are not valid in this case. Therefore, we start
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