13_Chapter 25 HomeworkCH25 Optical Instruments

13_Chapter 25 HomeworkCH25 Optical Instruments - Optical...

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Optical Instruments 349 The image distance for the objective lens is then and the object distance for this lens is 1 29.0 cm 0.920 cm 28.1 cm e qLp =− = = () ( ) 1 1 1 28.1 cm 1.622 cm 1.72 c 28.1 cm 1.622 cm o o qf p == = −− m The magnification by the objective lens is given by 1 1 1 28.1 cm 16.3 1.72 cm q M p =− and the overall lateral magnification is ( )( ) 1 MM 16.3 31.5 514 −+ = e M The lateral size of the final image is ( ) 32 10 cm × 29.0 cm 1.43 10 rad 4 ee hq θ =⋅ = × = .15 and the size of the red blood cell serving as the original object is 4 7 1 4.15 10 m 8.06 10 m 0.806 514 e h h M × = m µ 25.25 Some 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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This document was uploaded on 10/20/2011.

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