8_Chapter 25 HomeworkCH25 Optical Instruments

8_Chapter 25 HomeworkCH25 Optical Instruments - 344 CHAPTER...

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344 CHAPTER 25 25.11 His lens must form an upright, virtual image of a very distant object ( p ≈ ∞ 80.0 c ) at his far point, 80.0 cm in front of the eye. Therefore, the focal length is m fq = =− . If this lens is to form a virtual image at his near point ( 18.0 q cm ), the object distance must be ( )( ) () 18.0 cm 80.0 cm 23.2 cm 18.0 cm 80.0 cm qf p qf −− == = 25.12 (a) The lens should form an upright, virtual image at the near point ( ) 100 cm q when the object distance is 25.0 cm p = . Therefore, ( ) 25.0 cm cm 25.0 cm pq f pq +− 100 cm 33.3 100 cm = (b) The power is 11 3.00 diopters
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