24_Ch 25 College Physics ProblemCH25 Optical Instruments

24_Ch 25 College Physics ProblemCH25 Optical Instruments -...

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360 CHAPTER 25 25.54 (a) The image distance for the objective lens is () ( ) -2 2 11 1 -2 40.0 m 8.00 10 m 8.02 10 m 8.02 cm 40.0 m 8.00 10 m pf q × == = ×= −− × The magnification by the objective is 1 Mh h q p = =− , so the size of the image formed by this lens is 2 1 1 1 8.02 10 m 30.0 cm 0.060 1 cm 40.0 m q hhM h p  × == = =   (b) To have parallel rays emerge from the eyepiece, its virtual object must be at its focal point, or 2.00 cm ee (c) The distance between the lenses is 1 8.02 cm 2.00 cm 6.02 cm e Lq p =+= = (d) The overall angular magnification is 1 8.00 cm 4.00 e f m f = 25.55 The angular magnification is o m θθ = , where θ is the angle subtended by the final image, and o is the angle subtended by the object as shown in the figure. When the
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