Lecture 37 - Camera, eye, magnifier

Lecture 37 - Camera, eye, magnifier - In-class example:...

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1 Lecture 37 Eye camera magnifier Eye, camera, magnifier. In-class example: Magnification A converging lens has a focal length f . For which object position is the magnification upright and largest? A. 2 B. 1.5 C 075 1 11 s fs   C. 0.75 D. 0.50 E. 0.25 1 m ss ff      Upright 1 0 1   Not A or B Largest m 1 as small as possible Answer C  Combination of lenses (1) Analyze one lens at a time. Label quantities clearly. Be careful with signs! 10 cm 30 cm 1 30 cm  1 10 cm 1 1 15 cm 30 cm  First lens: 1 = –15 cm 2 = 10 cm 10 cm 30 cm
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2 The image from the first lens is the object for the second lens: 2 20 cm s  2 22 11 20 cm 1 1 10 cm 20 cm fs   f 1 = –15 cm 2 = 10 cm 10 cm 30 cm 12 10 cm 20 cm 0.33 30 cm 20 cm ss mmm     Total magnification: 1 = –15 cm 2 = 10 cm 10 cm 30 cm Combination of lenses (2) 1 30 cm 1 1 15 cm First lens: 1 = 10 cm 2 = –15 cm 10 cm 30 cm The human eye
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This note was uploaded on 09/21/2011 for the course PHYS 222 taught by Professor Johnson during the Spring '07 term at Iowa State.

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Lecture 37 - Camera, eye, magnifier - In-class example:...

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