14_Chapter 25 HomeworkCH25 Optical Instruments

14_Chapter 25 HomeworkCH25 Optical Instruments - 350...

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350 CHAPTER 25 The magnification by the objective lens is ( ) 1 1 1 12.5 cm 11.5 1.09 cm q M p =− , and the overall magnification of the microscope is ( ) () 1 11.5 10.0 115 e mMm == = 25.26 The moon may be considered an infinitely distant object ( ) p →∞ 1 500 cm when viewed with this lens, so the image distance will be . Considering the rays that pass undeviated through the center of this lens as shown in the sketch, observe that the angular widths of the image and the object are equal. Thus, if w is the linear width of an object forming a 1.00 cm wide image, then o qf 8 10 m w 1.0 cm o f 1.0 cm 3.8 1 500 cm θ = × or 82 1 mi 3.8 1.6 10 mi 1609 m w   
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